I didn't understand the opinion piece to be asserting that, but more broadly connecting the problem to the modus operandi of "the Left."
While that is probably true (I have not read him on doctrinal issues), it is also true that Walsh is often spot on re social issues, and often writing about social issues that a lot of others don't want to touch -- like the topic of this post.
Certainly discernment is important and your warning is welcomed.
Matt Walsh is young and involved in attempts to clean up the RCC. He spoke in Baltimore when the Bishops met there last fall. The dissidents, so to speak, such as Church Militant with Michael Voris had a pavilion in the inner harbor area that was the site of the teenage riot a few days ago. The Bishops were meeting in a hotel across a canal-like waterway. As they began their meeting, a notice came from the Vatican that they were not to do anything on the American sexual abuse crisis but that the Vatican would address it, but there was then a meeting in Rome, but, of course, nothing happened. That is when Michael Matt of Remnant Newspaper declared that the pontificate of Pope Francis was over. That was the first of the year sometime. Michael Matt goes to Chartres Cathedral from Notre Dame in Paris in a two-day procession that walks from Paris to Chartres. I think that that is going on now or very soon. That is related to Archbishop Lefebvre I think. I don't know exactly where Matt Walsh fits in but I think that it is with Church Militant in Detroit led by Michael Voris. Church Militant has some good people who have spent a lot of their own money trying to remove abusive clergy. Another very major figure is George Neumayr, whose columns can be found at The Spectator. Neumayr discovered where the Vatican was hiding McCarrick in Washington DC and probably thus forced the Vatican to move him to Kansas in a rural facility. Neumayr co-authored with Phyllis Schlafly a book about Obama called No Higher Power: Obama’s War on Religious Freedom.