This is excellent advice. In my experience the trail was really only shut down for a few months in spring 2020 while people figured out how the virus worked. Then people adapted and things got mostly back to normal except for the parts where you get back into civilization.
As far as shelters the only real danger is sharing the sleeping space with others. But nearly all of the shelters have plenty of tenting space so it is really a non-issue. Some of the trail clubs even put hand sanitizer in the privies.
The only other advice I'd add is for section hikers to avoid popular areas of the trail on weekends if possible. One of the biggest changes I noticed this year was a HUGE increase in the number of day hikers out on weekends. For example, I saw about 300 day hikers in 3 miles coming down into Delaware Water Gap on a Saturday afternoon.