I was just joking but surely I can revert a commit on a feature branch, no?

You can revert and even force-update the branch to rewrite it's history, but GitHub still tracks the old commits and even lists in the PR the events that rewrote the branch history.

sorry for misunderstanding, I am NOT trying to hide the fact I reverted, hence the alias dont-fuck-with-my-branch :) and I was overall just joking…