Earlier quoted context omitted.
The content in the book you're talking about is probably better represented by Professor Duane's original viral video on the topic: https://www.youtube.com/watch?v=d-7o9xYp7eE I think he wrote that book in part because he was frustrated by the lack of nuance in his presentation and the fact that it sort of "went viral". 13 million views for a lecture about law is pretty astonishing.
Yes, but iirc the best advice at the time of the viral video was invoke the 5th, but it has since evolved to do not invoke the 5th. Insist on your 6th .
Professor Duane has a video on that topic.