Well, that is an aweful comment indeed. And if it were true, I would never recommend the book.
I don't know if it is a person that is too hurting, or if it is a paid pharma shill, but the book is completely opposite of their statements.

It probably is more appropriate to say that healing this sort of trauma is very uncomfortable.
But, anything, other than hiding in the corner is uncomfortable.

The thing that really breaks this review is the "catch all complex-ptsd". It is not a catch all, it is a very specific set of traits brought about by a lot of (complex) trauma.

Anyway, I would suggest watching videos by these two

and if you resonate with them watch lots of their videos, they recommend the book.

Be well