The development comes after a presentation to the International Olympic Committee by its medical chief, which highlighted the potential physical advantages of competing in women's sport after being born male.
The "proof" consisted solely of checking that the passport said "F", which is what Khelif's says due to being incorrectly assigned female at birth. That's why new verification requirements are being added, because the old ones were laughably bad.
Khelif is biologically male, as verified by several independent sex tests (i.e. has testes, produces sperm, went through male puberty). Nobody that has seen the results will go on record saying that Khelif is female, but several different people have publicly stated that they've seen the tests and Khelif is male. The IOC itself admitted that it's a DSD issue (read: biologically male), and Khelif keeps chickening out when it comes to sex verification tests for some strange reason, even trying to fight new policies that require them going forward.
Why bother trying to push a false narrative? We went through the same process with Caster Semenya ("oh just a woman with high testosterone") who turned out to be biologically male as well and even fathered two children. What do you get out of deluding yourself?