First of all, without looking at the video, I would never give a caution, simply, for deliberate handball. Deliberate handball is not a caution offence.
I think a handball offence is harsh here. The position of the hands/arms are justifiable to prevent/soften the collision with the goal keeper.
Also not sure if it's the video quality or what but GK and outfield opponents are almost indistinguishable, save for the keeper wearing gloves and using his hands