The author might go on to make other points that are worth discussing, but lays out his supporting arguments clearly in the opening paragraph. Best practices do not necessarily do harm because they offer bad advice, they do harm because they are advocated for by zealots and the inexperienced.
My first reaction is how unfortunate it is that this particular developer has found himself in the presence of bad engineers and the inexperienced.
But then, the argument is automatically self-defeating. Why is the rest of the article even worth reading, if he states upfront what his arguments are and those arguments are very easy to refute?
It is deeply irrational to judge the merits of an idea based solely on who is advocating for that idea.
My advice to the author is to reflect on the types of positions that he accepts, the ones that have him so put off by the people that he works with that he is openly writing about abandoning what he admits could be sound engineering practice, solely based on who that advice is coming from and how it is being delivered.
Developing software is complicated. It is constant problem solving. When solutions to problems come about, and we abstract those solutions, it is quite easy for individuals to misapply the abstraction to an inappropriate concrete. To drop context and try to retrofit a lousy solution because that solution was appropriate to a slightly different problem. But at the end of the day, these abstractions exist to try and simplify the process. Any time you see a "best practice" or design pattern acting as a complicating force, it is not doing its job. At that point you can either be objective and exercise some professional curiosity in order to try and understand why the solution adopted is inappropriate ... or you can take the lazy way out and just assume that "best practices" are the opinions of zealots and the inexperienced who blindly follow because they don't know any better.