No he is not dummy.
Russians were tapped. As they should be. And Trump people were recorded, speaking to Russians, which they denied and denied and de..and oops got fucking caught.
They shouldn't have denied it, but to leak the TRANSCRIPTS of the call with the Americans named is crime.
But there are REASONS to denying, people don't just lie to Vice Presidents and FBI because they feel like it. They lie and take those risk because telling the truth is worse.
And the reasons for denying can range from embarrassment to not wanting to get into trouble with your boss to trying to hide criminal behavior. But, leaking the transcripts (showing there was surveillance) with American citizens identified is ONLY a crime.