That's not Antpool, that's Viabtc. You need to be really fast/lucky to be one of the 100 people to successfully submit within the hour, on the hour. I find this window disappears in a second or so. If I am ever successful, it doesn't appear again. I've stopped using it to help people now too.
Antpool's one is here:
https://www.antpool.com/user/prioritiseTransaction.htm?m=savePrioritiseTxYou'll need a mobile number verified to use it. It isn't very good any longer as it still prioritises higher fees, but at least you know you'll eventually be looked at. Try it, it'll happen in about 3 days or 15, based on my unscientific experience at your fee level and current mempool.
As xyakult says, very low fee, so you should tell the exchange to be ashamed of themselves.