I know I'm probably not meant to understand his overly simplistic logic, but it really does make no sense at all to me.
Why would the Japanese want to buy inferior cars not designed to meet the needs of their market? And even if they did, there are only 124 million of them versus 340 million in the U.S., so of course they're going to buy less.
In the real world, you balance trade by offering something else attractive in return, not by insisting that we all buy the exact same amount of each product off one another. It's the logic of a 5 year old and would inevitably lead to trade collapsing even without the imposition of tariffs.