I don't know if that's the case. I think riders of today are very different from the late 90's apart from Steve Peat mostly.
For a rider who wasn't super fit (I remember him puking after some races), rode with flats, has his focus on other sports at the same time, he did well.
Since Palmer was never much of a peddler, and was pretty happy to huck a lot of stuff other riders wouldn't, I think he could do well. Take into consideration more suspension to allow him to go off even more.
Most courses don't need much peddling these days, so holding onto the bike and letting go is needed more. Taking into consideration Palmer's MX experience (and have his forearms cut open to get rid of arm pump problems) I think he'll do well.
I'm looking forward to it!