I do not want to tell my current employer about Australia PR filing. What reason can I tell them to get an experience letter for the assessment?
If you can tell the truth about Australian immigration and can get this letter, you are good. If you do not want to disclose the reason for requesting this letter on the company letterhead, you can give the reason 'further studies in Australia'. If there is a question about why you need it for studies, then you can share the link to the Victoria university site which says foreign applications need to submit work experience proof.