It's not solving the Millennium Prize problem, which is to show that Yang-Mills theory without fermions makes sense…

It's not solving the Millennium Prize problem, which is to show that Yang-Mills theory without fermions makes sense and has a "mass gap", meaning that it predicts a glueball of some nonzero mass. But proving Yang-Mills theory makes sense is a big first step. And getting fermions into the theory is also good. Note how they're working with all the key bigshots in this particular su…