What doesn't make sense is how can they offer a debit card, set a price floor without purchasing XPY back at $20?

I'm assuming that:

         We will manange XPY to the $20 each with NO verification, as soon as you open your account!

Means that if there are buyers through their marketplace, then a sale would be facilitated by them to the third party. if there are no buyers of XPY at $20, GAW would step in and buy back the XPY as the buyer of last resort.

Another possibility, GAW only buys back XPY @ $20.. If the current marketprice is $23, then exchanging it through GAW would be @ $20..

And yet another possibility, GAW lets you exchange XPY to BTC or USD, but takes a 5%.