Pretty sure if he buys the model, it's his property and he can do whatever with it. Game Devs buy packs of assets all the time for games. No difference here at all.
For 'commercial use' in this case refers to using the model in renderings, not redistribution If the redistribution was allowed, he could buy the $195 model and resell it for $20 to steal sales from the original model and make money
Why do amazing cars that we need on the BeamNG gets cancelled on the BeamNG Forums, I don't care if the mod is trash, i still need it and it looks amazing