And not directed to TNVol specifically, but using the argument "When was the last time [party] won a statewide office in [state] is a very stupid argument with regards to presidential elections. West Virginia elected a Democrat statewide last month and no one is saying it will be competitive in 2020. Governor races are not presidential races. Next several gubernatorial elections I could see Democrats winning Oklahoma, Missouri, Indiana, Kansas, etc...
The inverse is not true though.
When is the last time that the president is able to win a state that his own local state party cannot win?
Okay, maybe Florida, but that's about it.