Is TMAGP having a hiatus or something? Because it's friday and ep 21 still hasn't come out yet.

Yes.

Protocol will have a short hiatus every 10 episodes with a longer one between seasons that has bonus content in it. This is to avoid production crunch for the team whilst also giving our other show Neon Inkwell the care and attention it needs.

Afraid I am not in charge of such announcements any more so can’t speak to when and where it has been said.