You're begging the question by asserting the universe = QM. QM is just a description. He's asking the if there is an alternative to QM that also fits the data,

You're begging the question by asserting the universe = QM. QM is just a description. He's asking the if there is an alternative to QM that also fits the data, that could make the universe the way it is; if there isn't an obvious answer that could update our understanding of QM.