OK, it is the right auction, it is linked to from the guy's team's webpage. And it is now restricted to pre-approved bidders, and still going up, so it would seem that it isn't prank bids.
The only things I can think of is that they are being backed by a company that was going to donate the money anyways (unlikely), or they feel the need to dontate $10 million of their own money to the relief fund, which has probably gotta be one of the biggest personal donations.