Disagree. I think he's attacking China because:
1) He's trying to deflect attention away from his own mishandling of the pandemic by shifting blame onto someone else. He does have a history of this sort of behaviour.
2) This is an election year, and bellicose posturing against an external antagonist plays well with the electorate.

Trump is incompetent and divisive, and is diminishing US standing in the world. I would imagine that opponents of the US, principally China and Russia, desperately want him to win the election... so despite him attacking China, it makes perfect sense for China to want him to win again. For all his talk of economic war against China, the two countries are inextricably intertwined and their economies hugely interdependent, if one attacks the other then they damage themselves, too.