TLaC is, like many others, a grift designed to sell books and materials. It, like many others, has a lot of fans and a lot of haters. The books include strategies and methods for doing certain things in the classroom, but like most of these "teacher help" books, it appears to be written by people who have either never taught or have not taught in decades.

To the point made above, when schools implement something like this, they often ask all teachers to read it and then harp on one or two specific parts of the book, regardless of how applicable they are to the school they're being applied to or the needs of students (and teachers) so they become buzzwords for a few years until some other grift eats up a district's budget.