From the very start of the article:
For a year, the big question of Russiagate has boiled down to this: Did Donald Trump’s campaign collude with the Russians in hacking the DNC?
What is there to say? That is not the central question for which anyone in the DoJ is seeking an answer. Maybe it's
a question someone's trying to answer, but it's not
the central question in the mind of Mueller or the Congressional leadership that's investigating the "Russia" matter.
Certainly, however, one can commence one's rhetorical spiel with that as the premise, but those who are closely paying attention will know that premise is sophistic as a starting point. Starting with sophistic premises is part of why we have saying "if they can get you asking the wrong question, the answers don't matter." Buchanan's opening statement in his essay is a fine illustration of precisely that.