For all the anger over this, rightly or wrongly. A better defender just heads the ball forwards instead of trying to be cute and flick it on.
He (and White for switching off and not being in a position to stop the cross) is at fault for the goal more than anyone else.
The danger zone is the centre of the pitch, not the touchline.
So, between the area you can see and are moving towards and the one you can't see, I will always head it forwards as did every central defender from my era. Flicking the ball onwards is much harder than just smacking your head into it forwards.
Plus, I'm not even 6ft tall and I can head the ball over the byline from the centre for the Goal. Gabriel is a lot more powerful than me so would have zero issues heading that out for a throw in.
Unfortunately he made the wrong decision there and it cost them. I think he will be watching that footage mid week and learning from it.