Even if he's doing this for all the right reasons, they're showing they don't know how to control messaging in these cases. If you have a plan, make sure you've got messaging ready to go. You don't say ONLY this right after PP says he's calling non-confidence ASAP, that sends a different message.
Just like if labour rights and the rail strike was what caused him to tear up the agreement, you don't wait 2 weeks and do that immediately after PP asks you to.