Just watched the highlights. They got this one perfectly right for me and it's a perfect use of VAR considering the context of the situation.
1- The ball never crossed the line fully after it hit his arm so it wasn't a goal
2- The ball deflected off the woodwork awkwardly and the lad had no way of knowing where it was going so the handball was completely accidentally
3- His arms weren't in an unnatural position and didn't move towards the ball to impact it (which let's be fair, would have been madness)
4- Had Robinson been on the moon, Fulham had two players in front of your nearest player and would have in high likelihood cleared it
You've had some shocking decisions go against you this season admittedly but I can't see this as one of them