What is the opinion of Reddit about the
Byrne’s Advanced Technique In Pool And Billiards?

For a player with your experience and SL, I would recommend:

https://www.amazon.ca/Byrnes-Advanced-Technique-Pool-Billiards/dp/0156149710

And a great book for players of all skill levels and all disciplines:

https://www.amazon.ca/Pleasures-Small-Motions-Mastering-Billiards/dp/1585745391/