I agree the gerrymandering of state districts can definitely influence the outcome of statewide races, but they cannot directly gerrymander the senate race because the only “district” is the state itself which cannot be redrawn.

So looking at the original question, are they gerrymandering the senate seat? No, they can’t. Are they unfairly influencing outcomes of the race through other means? Probably. Will it make a difference in terms of WV voting for a dem that’s not Manchin (ie is it “real”)? Probably no because the only thing keeping a (more or less) Dem senator in a state that went 70% for Trump is incumbency and his special relationship to the coal industry.