I treat anything sourced from Wikipedia like a Barak Obama campaign promise.
Can't refute it?
Sounds reasonable. Probably written by the same 'Ratroots.
Having been peripherally involved in a trade dress lawsuit through a former employer, I'm extremely familiar with the phrase "confusingly similar," and as questionable as Wikipedia can be at times, that is an accurate cite of the Lanham Acts.
Those knock-off books could be removed from all shelves, and all marketing halted by injunction, until the dispute is settled ... it would take years.