lots of people from 2016 are getting interview appointments. I heard from an immigration lawyer on YouTube that during the pandemic, the asylum office prioritizes the rescheduled interviews, then the applicants who recently applied in the past one month, and the rest of the interview slots are filled from the short list. I was called twice by the asylum office within one week of entering the short list. Let's say you applied in March 2020 when the asylum offices were temporarily closed, your case is buried in backlog now because it is not a priority.
The international travel to the US has dropped significantly in the past year. I checked the number of B1/B2 visas that the US embassies across the world issued in 2020 and it's been around 3-4% of the previous years. Even less than that for countries of high risk like China and Brazil. It's safe to assume the number of new asylum applicants is 3-4% of the past year by the same logic.