Sure but those returns have been delayed, not canceled in favour of a perma-remote policy. I don't think moving to Sioux Falls as an Amazon or Apple employee would work out 6-12 months from now.
At Amazon return to office is now up to middlemanagement some entire orgs are officially ok with full remote indefinitely. Outside these orgs some individuals can work from different locations on the same team. It's not quite clear what the average steady state will look like, but with a lot of internal hiring at Amazon, I would imagine things would gradually tend towards being fairly flexible
I don't think Amazon is entirely back to the office for corporate workers either.
AFAIK Microsoft is one of the few that dove head first into back to office.