Why on earth would you think that?
Saying that his posts are harmful is a bit of a stretch.
Mentor your first few people who keep defending rookie mistakes with "But Uncle Bob said..." and you might change your mind about that.
Bob Martin says some sensible things, but he also says some things that are at best debatable and at worst outright contradicted by the evidence base, and he says all of them with great conviction and presumed authority so that his target audience can't tell the difference. That alone makes him dangerous as a source of advice.
I have been developing for 54 years. I have been through all manner of design philosophies, from Structured Programming, to Object Oriented Programming, to Agile, to TDD along with hack-it-till-it-works.
If you don't do the engineering, which he does not teach, you are going to struggle.
I believe this is a harmful post.
So I agree with the parent ... his writings are in many cases harmful. They're a mix of good and bad, but often net harmful.
Saying that his posts are harmful is a bit of a stretch.