OK, I haven't got the Gene Maze book so I don't know how he describes his grip, but Erdnase's description is that the "middle of the first joint of the second finger" is against the corner. Now, based on the illustrations, this does allow for the possiblity that the pressure applied by this finger is predominantly on the front end of the deck. Therefore, a strike bottom is possible from this grip, or, as Erdnase describes, a push-out without a buckle.
In the description for the two-hand deal, he doesn't mention buckling the card, and then in the description of the one-hand deal, he says "instead of pushing out the bottom card as in the two-handed deal, it is sprung back a little by the third finger tip". I read "sprung back" as synonomous with "buckled". I think the only reason why people think it should be buckled in the two-handed deal is because it would make it easier if your grip was putting too much pressure on the side of the deck. If you accept that my interpretation of the push-out is correct, it follows that the front-pressure interpretation of the grip is probably also correct, as this would help facilitate it.
Anyway, I'm happy to agree there's no absolute definite answer to this kind of stuff, but I love playing with Erdnase techniques and trying to find my own subtleties.