I took computational investing on coursera, which seems to have some overlap with the contents of the book. Course involves building and back testing stock trading strategies in python.
I'm amazed that GT let him teach that course. It's full of errors, omissions and bad habits. I vaguely followed along, and the most noticeable thing was how much the students complained about the low quality of the course.
The only result of someone implementing the advice in that course is that they'd lose a lot of money quite quickly.