Graham Potter didn't have much choice after the match against Arsenal. He was never going to come out and throw his players under the bus. This is a team he has known for two months and a squad of players he needs to impress.
Part of the risk of taking on a manager without elite level experience is that Chelsea is a new environment on the best of days, on the worst it's a hostile animal that can eat you up and consume you relentlessly. These are new challenges for the manager.
This job would have been tough enough in pre-season, such is the size of the changes needed over a period, and Potter was given less than 48 hours notice before swapping jobs. There's nothing normal about this.