Ugh.  At some point I need to learn the new 2021 stuff.  I've gotten incomplete bits and pieces of stuff but mostly I've been focusing on surviving 2020 tax season.

When they extended it from 12/31/20 to 3/31/21 they kept the term "all preceding calendar quarters."

When they extended it from 3/31/21 to 9/30/21 it looks more like a reboot with the terminology updated to say "preceding calendar quarters in such calendar year (other than the first quarter of calendar year 2021)."  So starting 4/1/21 you're allowed to get COVID again (and get paid).