Disclaimer: 1) Your post makes sense considering noobs' reputations. 2) Not arguing with you. 3) I've liked your posts. Simply, no e-beef in this post.
That program can be understood in about a half hour or from a quick skim of and detailed read of key parts in the book. If someone can't wrap their head around a workout consisting of bench press, curls, and squats, or overhead press, chinups, and deadlifts, with some plugins for weak parts or desired muscle size, something else is going on.
Greyskull corrects SS's weakness, I believe, namely progressing in reps after a stall (double progression) or progressing with better autoregulation when reps over 10 in key lifts are reached. Plus being it has more volume for upper body and upper body is hit before lower body each session, there will better muscular balance and symmetry (bodybuilding term) for the body. I've heard quite a few people dislike their lower-body-dominant results with SS.
And I think it's good if he takes the time to look into the GS philosophy overall considering Johnny Pain emphasizes sound bulking (not that GOMAD stuff) and recommends other activity such as recreational sports, running, conditioning, and the like, rather than Rip's recommendation of lifting three times per week, overbulking, and little or nothing else (unless I missed his recommendations for better nutrition and other activity).
The GS LP ebook can be read in a few hours, and a routine can be written in very little time and can be implemented tomorrow.