7/5 is 7 VPIP, 5 PFR i.e. super tight.
https://forumserver.twoplustwo.com/7...uncements.html
$50 at 50NL means the player has 100 big blinds of 50 cents each i.e. $0.50 x 100 = $50.
Never read the book but my guess is the author recommends raising to $1.50, something like that.