I checked his BTC address and it has total balance 0.11, however on the to of website it says 310 BTC reward.
I doubt he has made this puzzle page for fun and time pass, puzzle is too hard to solve, may be someome can solve amd verify if he is paying really
It got solved by 3 guys and they split the amount between themselves (can be seen in the txn link posted by NeuroticFish above). There was a dedicated community of people trying to solve it in the Neon District Discord. They announced the puzzle getting solved and being split by 3 people. So there's only BTC dust left in the wallet now.
Here's the Reddit thread maintained by the person (Pip) who set up the puzzle:
https://www.reddit.com/r/Bitcoin/comments/9kq7it/introducing_the_310_btc_bitcoin_challenge/