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Though it's pretty ambitious (of both of us) to credit any minor leaguers with Aaron's wrists.
In the vid you posted, you can see the incredible power of the forearms especially in the followthrough. Romero takes the top hand off the bat on followthrough.
But yeah. Aaron perhaps got away with a certain lack of leveraging just because his hands and wrists were generating the leverage. To that extent, maybe you've got a point about Romero's gliding.
Of course, Romero may STOP drifting forward. He just moved up out of the low minors. He's already staying back on some swings, notably the HR vids you see...