Foul? Possibly, probably even, but as I said earlier, there are countless goals given or not given during a season which VAR could look at and overturn. There's always some pushing, some tugging, some arms out, a bit of holding down, a bit of physicality that could be called as a foul. Keepers are almost always in the mix in goalmouth incidents, that's the game.
I reckon if you looked at every single goal over the season that came about in similar circumstances, you could find a reason for a VAR involment in a huge number of them.
Again, as I said earlier, VAR can be and is used to manipulate the outcome of games. Tonight's perhaps the most significant VAR decision in Premier League history, it has almost certainly decided the title, but probably not the worst decision of all of them.
And finally, nothing will ever convince me that had the roles been reversed, and that goal had been a winner for Arsenal, it would have been ruled out.