The length is irrelevant.
The only thing that counts is the content, which exonerates Trump, not condemns him.
Rush makes the point that it was obvious from the start that Trump didn’t collude with Russia, and there wasn’t any evidence which actually suggested it.And that therefore the Mueller operation was never an “investigation” - of what? - but a PR operation against Trump. An attempted silent coup. Mueller didn’t find anything to exonerate Trump, because there was nothing serious to counter - and you can’t prove a negative.