the 'Russian conspiracy' argument is patently such nonsense, or at least any version of it where the DSD test's results were fabricated is a nonsense.
i wouldn't put it past Russia to leak something like this if the athlete involved was a big medal prospect representing one of its 'enemies'... but only if it were true. you can bet that if the leak weren't true the IOC would immediately say so. if Russia was in the business of spreading lies about other countries' athletes a far more obvious target would be, say, Brittney Griner, who spent a long time in a Russian jail cell (for completely unrelated reasons) and who is a key player in team USA's bid to get gold in basketball. the fact that no such stories got put out to me almost certainly say that Griner is indeed female, despite being 6'9" and having a voice in the bass range.