Yes. Under this interpretation of the flood, which is a plausible one, it would certainly not follow that all humanity is from Ham, Shem, or Japheth.

That interpretation would make my comments on all humanity being descended from Noah incorrect and your statements fully consistent.

It doesn't strike me as being in the realm of takes that are acceptable as certain (of which I also have my share), but it’s a valid take that I hadn’t previously considered and thank you for.