Definitely not saying I don't believe Sara's reason because they obviously know better, but if it's untrue then it's also completely possible it's budgetary? We don't know if they're the only one who got axed. Maybe they're looking to trim a bit seeing as the 3 OG's probably get paid a lot + filming in this city can't be cheap. The streamers have seemingly been cancelling shows left and right after the strike. Just a thought.
I wouldn't mind if the show came back slightly re-focused/retooled with Carrie, Miranda, Charlotte, LTW and Seema as the remaining cast members.