Yes, there are two possible qualifications for 2020: a reduction in revenue or a "full or partial shutdown of your business due to COVID-19".
The IRS describes the latter scenario as "a required partial or full shutdown of your business during 2020" by a government authority. Applicable events include operations limited by commerce, the inability to travel, or any restrictions on group meetings.
Here are some examples:
A restaurant that was forced to close or limit its on-site dining (such as having to close down every other table due to COVID-19 restrictions)
A business that needed to meet with clients in person, but due to COVID-19 restrictions, had to cancel these meetings
A business that reduced its operating hours because of COVID-19 restrictions and cleaning requirements
A business that delayed its production schedules because of supply chain disruptions
A business with a planned event that was canceled or forced to restrict the number of people who could attend due to COVID-19 restrictions