I don't know if the person who recommended the Pearls book really needs to be completely avoided. FWIW, the woman who gave me a copy of TTUAC is a wonderful, Godly older woman. She has four grown sons who are all great Christian men. Honestly, I was SHOCKED when I read the book that this woman would recommend it to me. I can only assume that she never actually read and/or implemented many of the suggestions with her own children. I don't really know the backstory there. I just know that this woman and her family are loving, Godly, wonderful examples, and I have no idea how or why she recommends the Pearls book.
To be sure, I would be wary of someone who recommended that book to me who I didn't know well. But some people pass along a book, blog, website, etc because they're heard it recommended by *others* without necessarily having full knowledge of all the content, IYKWIM.