The people that spread this shit probably just quietly moved on instead of posting a correction and apology. The people that read their shit then never saw the truth.

A lie can make it halfway across the world before the truth has had time to lace up its shoes, to paraphrase an old adage

There could be a complete genetic breakdown of Khelif posted tomorrow to every news outlet that proves, conclusively, she is a cis woman, and it wouldn't matter. The lie that started everything is more interesting and has more staying power

People who aren't invested in it but who hear it casually in "reputable news sources" aren't going to inform themselves on any corrections, the damage is already done