I read the article, and I even read through the presentation linked in the article. I didn't read the book, but I'm also not giving a qualitative review of the book.

I'm talking about why people don't think it's worth engaging with to begin with. It's not that his critics are afraid or incapable of engaging with him, but that he's being dismissed out of hand because (regardless of whether it's true or not) he presents as a crank who doesn't appear to understand the field he's attempting to critique.

There's an infinite supply of cranks in the world, and it's usually good practice to avoid engaging with them.