I am absolutely not accusing Khelif, or anyone else, of pretending to be something she's not. The evidence is clear she's a male athlete who grew up with a disorder of sexual development, but it's possible in that scenario to be raised as a girl and not learn of the condition until puberty. I think accusations of bad faith against Khelif are cruel.
To answer your second question, I don't think any male athlete should compete in women's sports, since it negates the purpose of having sex-segregated categories. I believe it's possible to preserve these categories without excluding or vilifying transgender athletes. And I think this sentiment is in line with the vast majority of people who understand there is a tension between affirming people's gender identity and being fair to female athletes.
("Ageist" is a joke about the non-sequitur accusations of transphobia I got in response to my tweet.)