You’ve made your case and stood your ground, and until it’s an official policy and nothing more than “guidance” you’ll probably be ok, honestly.
A few months back I was offered a promotion and a fancy new job title, with the caveat that I would need to move to another country. I countered with more or less the same argument as you, “I’ve been doing this from home for years and everyone I work with is remote anyways; I’m not moving” and was met with a “hmm…fair enough”.
Neat