I wouldn't personally deny Chukka's careerist intentions, but considering his constituents are in the largest Remain voting area in not just London, but the entire country, it's not without a smidge of warrant to say he's acting on their behalf, optically if nothing else.
My greater concern is how easily and flippantly things like principled rebellion and "doing what's best for the party" can be turned completely on their heads by certain people when it's suddenly in their interest. Add to that engaging in the very same kind of agenda slanted "reporting" that so misrepresented Corbyn during the election, and you've got an uncomfortable sense of valedictory hypocrisy. However you may feel about it, and whatever merits it has in this particular context, it isn't a good look, is all. It worries me people can't see that.
I just think some small sense of acknowledgment would be preferable to "no, it's completely different because evil centrists blah blah" I'd rather we retain the moral high ground than swap one kind of absolutism for another.