There is evidence, but they are DENIED.
C'mon man, I mean, girl! Get with it. This is the Harris/Biden administration-era Newspeak. Evidence denied by the all-powerful authorities means it doesn't exist. If they say there is no evidence, then there isn't, by definition (even if there is).
The first step in establishing a tyranny is to co-op the language. We've been down this road before. Listen with the ears of history, back to the late 1930s in Europe, when one particular despotic regime's modus operandi was, they'll believe it if we say it.