Remote work is hard, you need technology, culture, and people all working together to make it efficient. You can't just buy a Slack/Zoom license and expect to suddenly have a productive remote work environment. On the other side, they probably have spent decades to improve physical offices, meeting rooms, desks, seats, lights, it's not a surprise that probably every corner of the space was designed for helping people work better. When they say "we believe RTO is better", it's difficult for me to argue, because of course you can believe one way is better than the other since you didn't really try the other!
I wish these companies just find a different way to lie. It's not "we tried and it didn't work". No, you didn't try at all, because leadership does not care or too lazy to change for themselves.