You appear to be correct, they have declined to provide evidence, even in closed hearings, they have not admitted to having no evidence. It's merely highly probable that no evidence exists.
> It's merely highly probable that no evidence exists.
Could you explain where this comes from? I think the track record of our military operations, and our surveillance systems (which Trump helpfully leaked), suggests the complete opposite, that they have precise knowledge of the source, destination, etc, with democrats even having faith in the intel, and more of a problem with transparency [1]. Biden was getting things going in 2022 [2]!
I mean, the fact that this administration flat out lies and bullshits about everything more or less as a matter of Surkov-type policy and is essentially run on weaponised bad faith does not encourage any other conclusion.
Also, I repeat: the guy responsible for that navy command is stepping down in terms that appear to be highly unusual.
The most significant thing you can do for your understanding of this situation is to understand that this is not inside baseball, niche knowledge, nuanced interpretation stuff. It's Calvinball.
