If you consider the absence of evidence as evidence of absence then sure 99% above the board. If on the other hand you consider that any hint of misdoing by prosecutors, much less lying to a judge in any context, much less within a secret national security court, as smoke that may or may not indicate fire in other places, then one might not be so sanguine.

Durham had years and his only goal was to discredit the investigation. All he came up with was bullshit. That's more than evidence of absense. It's not absolute proof that everything was above board, but it's very suggestive.