qwertyuiop1998
The Vampire
To cement my point, just previously before Hulk received the hammer. Gamma Thor was physically killing him
https://ibb.co/Qjs3Ffc
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https://ibb.co/0mWb5jy
Then later, after receiving the hammer, the Uatu's universe statement came in. Then, after a few pages, gamma Thor still physically overpowered Hulk with Mjolnir(literally tearing up an arm from him even). Hulk tried to resort to the tree, but it's still not enough, and Gamma Thor's ending the reality statement came in
So to recap:
The Uatu's universe statement(which is never directly referred to Hulk's powers) is after Hulk already gained Mjolnir. and Hulk was physically being killed by Gamma Thor previously
Thor later had a directly statement saying he was going to end the reality, and was overpowering Hulk with Mjolnir before that
So basically, you really can't transfer the statement to Hulk's powers in any way. for 1) Hulk had Mjolnir 2) Hulk was fighting a superior of his, whom directly stated capable of destroying the reality and the statement never made clear how the universe was threatened(again, for all we know, it could be referring to Gamma Thor's powers)