Eh, the IBA. Their involvement alone is sketchy. Their president, Kremelev, has said both that their testing showed elevated testosterone levels and that no testosterone tests were performed but didn't disclose how their testing arrived at XY.
There are several reasons they no longer oversee things and were effectively kicked out of the IOC.
Let's see how this plays out. Might be more than meets the eye.
Khelif has never, ever been considered a world beater and only has 5 knockouts. Been very beatable until recently. And the gender test issue popped up after beating a Russian fighter last year. If any other group had raised this, it would be pretty believable.
Lin Yu-Ting has had an even less impressive career. Had no issues until last year.
If the IBA really did test for testosterone and not actually do genetic testing, their already tattered reputation will be irreparable.