I'm fairly certain DJ's swing is nothing like Mike Austin's other than the obvious commonalities in all good swings. Mike Austin's swing methodology is all about release and throwing the clubhead, DJ's hand action is about the complete opposite.
Mike Austin had the gift of speed, but his swing was fairly conventional. His secret IMO is how he managed to make a lot of money convincing people that he had one.
How? In what ways?
It seems to me someone could easily say Dustin is a great example of the modern golf swing given that he's a very modern athlete and works out and uses his Trackman religiously and so on.
Mike Austin never even won a PGA Tour event. Co-opting a good player and saying "they use our swing" is such a marketing gag.
This has nothing to do with the on course rhetoric, it has to do with the botched holes, short putt percentages and inability to corral his drives on a frequent basis.
I like him as a player but he is frustrating to watch at times.