This seems to have gotten very popular after 2010 or so, but not many ascents recorded between then and the fa in 1989. Seems odd that some of the strong people aroun at the time (Ben, Jerry etc.) wouldn't have had a look? Could be their ascents are just missing though.
because it was harder apparently. "key holds" coming off after Tony's ascent according to https://www.climber.co.uk/news/full-sp-on-mina-s-bat-route-ascent
Good find on that link, makes a lot of sense. Classic Steve coming along and opening it up again!