All I thought offers like these are actually scams but you really hit the wagering requirements so that is quite a guarantee that Bitcasino will allow you to withdraw Assuming you will also submit the KYC. Most casinos today will not give you the pass without it. If they hold it or 48 hours I can understand or maybe even week. That's what I read in some threads where users are trying to withdraw a sum.
All Bitcasino bonus offer has an easy wagering requirements compared to competitors. I'm not aware to this promotion and this is really a very good offer for those who will create account using metamask.
The OP has an evidence for winningthat huge jackpot price on hacksaw gaming that makes him finish the requirements in huge profit. I don't see any reason here for his profit will hold due to his proof of winnings on slot.