How do I mute an author and all of his/her articles?

There is an author here who also runs a pay subscription service who berates anyone who disagrees with his articles in the comments.  He also refuses to change data he presents when multiple users point out a simple math error because changing it would make his claimed returns much lower (one example is he has graphics showing a % gain over 5 years and claims in the article that number as his annual return over 5 years - a MASSIVE difference).  I will not name the author because anyone wanting to pay for his services should do their own due diligence anyway and his comments are available in most of his articles, but I will say that if you're looking for REIT advice, pay closer attention before spending.

There is no way I would pay for financial advice from this abusive "analyst" and frankly, I've given up on him being able to show even an ounce of intellectual honesty - I don't even want this articles showing up in my feed.  How do I block an author entirely?