While I agree that his advice was poor your reason for saying his advice sucks was almost as bad!
There are many people with big arms and small shoulders/back/chest/legs. Think about all of the people you see with a huge back and tiny arms. There are even a couple people like that on this forum. Hell, look at Marcus Ruhl's triceps! They are freakin' tiny compared to the rest of his body! Some people just grow at different rates.
The rest of your advice is right on the money, though. The less I trained my biceps the more they grew. Now I always train biceps with back and triceps with chest.