It's really a "pick your poison" situation imo, so I understand Golden trying to mix it up to find something that might work. I think I would have preferred X staying back, especially since your blitzes haven't gotten home all night. But ND was literally at the end of their rope. They had played almost 50/50 man vs zone in the game. They tried dropping 8 in key situations, they tried bringing 8 in key situations, etc.
They mixed everything up, and none of it worked, so I get Golden going for broke. Either you get home finally, or else you hopefully rush the throw and force a mistake. And if that's the decision you're making, of course you're gonna send X on the blitz to try and do what he's done all year... deliver a game-changing play.