Question: Is it still possible to apply for a tier 2, 4, or 5 visa?

Answer passage (source: UK):
page_title: Guidance Coronavirus (COVID-19): advice for UK visa applicants and temporary UK residents
section_headers: If you’re working for the NHS
section_content: Some frontline health workers and their families will get their visas
automatically extended because of coronavirus.
There are also changes to the conditions of visas for some frontline health
workers. These changes will apply to you if you work for the NHS or
independent health and care providers as a:

biochemist
biological scientist
dental practitioner
health professional
medical practitioner
medical radiographer
midwife
nurse
occupational therapist
ophthalmologist
paramedic
pharmacist
physiotherapist
podiatrist
psychologist
social worker
speech and language therapist
therapy professional

Check with your employer if you’re not sure whether you work in an eligible
profession.
If you will be working at a different NHS site than your usual place of
work because of coronavirus
You can work at any NHS hospital during the coronavirus outbreak if your
sponsor can maintain their sponsorship duties.
Sponsors will not need to notify UKVI of the change in your place of work.
If you do any different or extra frontline work due to coronavirus
You can carry out supplementary work in any role at any skill level during the
coronavirus outbreak. There is no restriction on the number of hours you can
work.
Changes to the current restrictions on the number of hours you can work or
volunteer
There is no longer a limit on the number of hours you can work or volunteer
each week if you are a:

tier 4 student
tier 2 worker and your NHS job is a second job
visiting academic researcher
holder of a short-term visa and are permitted to volunteer

If you’re a pre-registration nurse in the UK, the deadline for you to sit the
Occupational Structured Clinical Examination (OSCE) has been extended to 31
December 2020.
If you do not pass on the first attempt, you will have until 31 May 2021 to
pass the exam.

Reviewer feedback on this answer:
This answer does not elaborate on if it is still possible to apply for tier 2, 4 or 5 visas.
This discusses healthcare workers and visas, but doesn't address sponsorships.

Reviewer ratings:
Bad
Bad

Answer passage (source: UK):
page_title: Guidance Coronavirus (COVID-19): advice for Tier 2, 4 and 5 sponsors
section_headers: If you have issued a Certificate of Sponsorship (CoS) or a confirmation of acceptance for studies (CAS) and the sponsored employee or student has not yet applied for a visa
section_content: The employee or student will still be able to apply for a visa.
The start date for the course or employment stated on the CoS or CAS may have
changed. We will not automatically refuse such cases.
For example, we may accept a CoS or CAS if they have become invalid because
the employee or student was unable to travel as a result of coronavirus. We
will consider this on a case by case basis.
[CoS]: Certificate of Sponsorship
  [CAS]: confirmation of acceptance for studies

Reviewer feedback on this answer:
It answers that the person can still apply for a visa and gives some information about how the applications will be handled.
This answer does not relate to tier 2, 4 or 5 visas and this relates to just applying for visas.

Reviewer ratings:
Acceptable
Bad

Answer passage (source: UK):
page_title: Guidance Coronavirus (COVID-19): advice for Tier 2, 4 and 5 sponsors
section_headers: If you’re sponsoring an employee who’s waiting for their Tier 2 or 5 visa application to be decided
section_content: You may allow employees to start work before their visa application has been
decided if:

you have assigned them a CoS
the employee submitted their application before their current visa expired
the role they are employed in is the same as the one on their CoS

Your reporting responsibilities for an employee start from the date you have
assigned them a CoS, not from the date that their application is granted. You
will not be able to report information to us using the sponsor management
system. You must however ensure that you record and maintain all the relevant
information set out in the sponsor guidance on your own systems. Any changes
that will impact the eventual consideration of the migrant’s visa application
should be updated on the CoS, as normal.
If the employee’s application is eventually rejected as invalid or refused you
must terminate their employment.
*[CoS]: Certificate of Sponsorship

Reviewer feedback on this answer:
This answer does not relate to tier 2, 4 or 5 visas and only discusses the working rights on certain visas
This if for employers who want to allow workers to start before their application has processed

Reviewer ratings:
Bad
Bad