Watching this live, I remember thinking the stick might be a bit too high and that the goal should be disallowed.
I saw forum posts which provided evidence that the stick may have in fact been too high. Keep in mind, this was a big goal that sort of turned the tide and gave the Kings some motivation.
To conclude: inconclusive. If the goal was disallowed I still think the Kings would have eventually come back to force an overtime. It’s just how they have played these playoffs.