Technically, this isn't a bootleg which are are performances that have never been officially released, such as a live recordings or studio takes.
This is a pirate recording or possibly a counterfeit pressing, since it used the cover of the Japanese release. At the time this was released, as far as music goes, Taiwan didn't have laws respecting the USA's intellectual property rights. So this was legal in Taiwan. However, Discogs is the only website that doesn't allow sales of these records.
discogs terms this (pressed on red vinyl, also on black vinyl) unofficial, and further states that sales of this are blocked; does this mean it was/is still (?) produced as a bootleg?