The label "tariffs charged to the US" is just straight-up wrong, either due to incompetence or malice (likely to justify the high tariffs).

But basing the tariffs on import/export ratio makes sense if your goal is to be a net exporter with every country, as it discourages imports until that's the case. It's still somewhat arbitrary though; my guess is that the White House is pursuing that goal mostly for political, not economical reasons.