I think it was a foul also but very soft.As a relative neutral on this...
VAR aside I think it was a foul...just. Soft, but if you try to tackle from the wrong side these days & make contact with the man (and not the ball) then you can't complain too much.
Does it reach the "clear & obvious error" threshold? Not really. But Arsenal did gain an advantage from a foul.
The ref signalled to play on though so he was happy with it and then VAR did VAR things.
It’s just annoying how inconsistent it is, some the decisions over this weekend have been bordering on comical.