Yeah, if you watch Gabriel, he stoops in order to try to flick the ball back over his head and as raises he head and arches his back, both of Joelinton's hands stop him from doing this. It's a clear, stonewall foul. That is unless you think he should be penalised for not trying to head it somewhere else, or not understanding, like Gary Neville, what Gabriel was trying to do.
It was also such an easy out-ball for the VAR, considering the other aspects that it's suspicious that they've not given it.