I said last week that he should have been arguing against this years ago, but I do agree with the thrust of the article.
He doesn't mention United or Liverpool (or City), and the overall argument is that it's a bad thing that most of the Champions League billions have gone to just a dozen clubs - which is targeted at a group including Liverpool and United. He even suggests that the Liverpool comeback against Barcelona might be seen by some as a dramatic peak, but it's actually just a symptom of the money being concentrated in the hands of a few teams.
One of his conclusions is something that I think needs to happen if we're ever going to improve competition:
Essentially he agrees with the argument most of us on here make, that cost controls (FFP/PSR etc), just protect the already wealthy. Unless football finds a way of sharing money, rather than simply giving rich clubs more and more, we are stuck with a more predictable Champions League.