Don't let it fool you, they'll make exceptions to the rule for the ones they want to keep. This is just a way to make their "worst" performers miserable so they quit instead of laying them off. All the shit tech companies are doing it.
As a datapoint from the other side, my company (big tech) is holding the party line no matter what. Lower level engineer or director - if you don't come in the requisite number of days a week, you're out. It's a bafflingly short-sighted move, but company culture is more important than anything apparently.
You don’t have to waste people’s time and burn gas in traffic to foster a meaningful company culture. This is just about management egos needing to feel important, and always has been.
I'm just imagining some high up executives who knows exactly how much the office cost and takes to maintain and they go into the office for their big wog board meetings and get angry that no one is using it.
Meanwhile, my company (small/mid tech) is going all-in on remote because they pay so little and run it so much like a sweatshop that they have no hope of attracting even mediocre talent otherwise. I’m looking for something else, but fully remote is drying up and it’s been more mentally difficult than I expected to wrap my head around dragging my ass to an office 3+ days a week to do the exact same work I do at my house.