I am not sure I find this explanation convincing. If a corporation thinks it could increase profits without RTO and after eating office real-estate losses, it'll do so. The real estate companies and the middle managers do not make decisions for these companies. If wasted office costs are $10M, but more happy, productive, and efficient remote employees make an additional $20M, there wouldn't be RTO.

Are certain cities (like NYC) taxing unoccupied office space? If so, how much? This information is much more convincing than a claim that companies are enforcing RTO to make middle managers feel like they are "presiding over their kingdom".