I'm biased as a remote worker (and I'm more than a little nervous from all the recent RTO mandates), but this shift doesn't feel connected to reality. Teams have changed a lot in the last 3 years. For many people, teams and coworkers are distributed more than ever, not just remote vs. office but also in different regions of the world. Sitting in an office doesn't add value when most of your meetings are still virtual.
I would think if there was real data to support the return to office, this email would have included it. Instead, it just includes some truisms like "teams tend to be better connected to one another when they see each other in person more frequently." There's no concrete data on whether this leads to more productivity across the company.
The cynic in me believes this is about reasserting control over workers and justifying large real estate investments.