It's somewhat true. I have worked remotely before. From my own experience I can charge about 2 times more when I can come to office in central London every day

It's somewhat true. I have worked remotely before. From my own experience I can charge about 2 times more when I can come to office in central London every day than remote. So that's also a trade off. I could go back to remote and live in some cheap area but again I think it would hurt my career. The path to progression / promotion when working as remote employee is much longer. Being in the office and building relationships face-to-face, and learning how to navigate company politics is necessary to get to the next level.