So if you do an extreme overclock, use an expensive water cooler, make it even hotter than it already is, void the warranty and probably cut the lifespan down to a 1/3, risk stability issues, then it can match RTX 2080 at stock, which costs the same as Radeon VII.
If you're going to compare an overclocked Radeon VII, then you need to compare it to overclocked competitors.
There is no question about it; no matter how you angle it, Radeon VII is an inferior gaming choice both to RTX 2070 and RTX 2080.