It has not been disproven, as the whistleblower revealed.
See #16
Also, one cannot disprove anything.
For example, can you disprove that all the socks that go missing in dryers are really stolen by the KGB to be linked together to provide winter coats for Russian soldiers hiding in northern Alaska ready to swoop south and attack Bakersfield, California!
Or, can you PROVE you are not a gay child rapist. I’m not saying you are, but could you, or I PROVE we are not?