He just realized that there may be a very little amount of total coins. Also a couple of the big wallets im sure will hold so the number of tradable coins will be even fewer. That along with the fact that a bunch of people will dump after day seven could be used for profit. The dumping will drive the price to shit, so there may be some really cheap coins to be had. He is planning on buying the dump.
On day seven there should be early exits during the high interest period to beat the rush. The biggest wallet is one of the earliest that can exit. They will stake for the final time with 13 hours left.
Really, the earlier you exit staking the better your chances of taking advantage of high prices.