I can definitely tell a difference, and that’s pretty big considering you’ve been training for a little over a month.
His rant is “ok” but a lot of other coaches would disagree on some points.
But something that he doesn’t mention in his own rant is that alot of his programs cycle in body part splits sometimes, and in the same program he uses upper/lower and full body splits as well. A friend of mine is doing one of his year long programs now and it cycles to body part splits for short periods of time.
But you are right about one thing, building overall mass is what’s important right now. When you reach a point where you feel you REALLY have weak points, some isolation would be fine.
Something you can do with that program is this…If you can handle the work capacity right now and you feel ok to start adding an exercise or two here and there…you can cycle in different isolatory exercises. example…this month you do some bi’s+tri’s work after every workout…maybe bb curls and overhead extensions or just different arm isolation work at the end. Just one exercise a piece…then next month maybe incline flies and reverse flies one day…maybe some straight arm pulldowns and pullovers, etc etc. This is something I’ve just started doing. I was having a hard time choosing between isolation work between larger muscles and arms…so I am going to cycle between the two of them.
Don’t misunderstand though, only top pro’s really need to isolate muscles all the time and they do so at the expense of joint integrity and flexibility sometimes as well. As a recreational bodybuilder, I really recommend a balanced program with compound lifts to create a well proportioned, healthy physique.