I didn't think it was a fumble. I forgot to look for the deflection, but, did notice it seemed to flick up suddenly (seemed like an intended to me watching on a small youtube screen, but that was probably the deflection of which you speak) . In fairness I can see why they would say that in the...
It doesn't help that commentators spout that cliche about having "done the hard part" to when players get into a 1v1 situation, as if scoring a goal is the easy bit.
Because the radio/seagulls player's commentary on the second goal was along the lines of "he's past halford, STOCKDALE FUMBLES, GOAL!" I've not seen it yet, so not sure how much of a fumble it was (it was also described as a weak hand), but that will have painted a lot of fans opinion of his game.