Having a PM with a FPN would depend on the circumstances and also whether they agreed with it.
I don't think Johnson thinks he did anything wrong.
If he said "Fair enough, we did have parties during lockdown, there was a culture in Downing Street of socialising whilst the rest of you were locked down, we shouldn't have done it, I didn't tell them to stop partying", then I might have some respect for him.
However - this is NOT about the parties, but about misleading Parliament.
It does not sound like he asked for reassurance that all guidance was followed.
Despite telling the House that.