Fwiw, I got a lot of pushback at Google when I requested to go to 80% or 90% (4 day week or alternating 4/5 day week) for the sake of my mental health. I tried to be firm about that being the best accomodation for my needs and got nowhere except seriously burnt-out months later, put on a PIP, worked my ass off to get off the PIP, and finally quit when I couldn't just suffer through the burnout any longer.
So take those "policies" with a grain of salt.