I admitted 20 was low, Dbol is a harsh oral, some folks won't touch the stuff at all. The only common anabolic worse is Anadrol.
The tren is an injectable, big differerance. 350mg a week is reasonable I guess depending on what else is stacked with that. I wouldn' have suggested that at all for a first cycle though either. Maybe 350 a week of test.
I admit, I would far rather err on the safe side, especially if one were just starting his first cycle. Probably the best advice the guy got was to forget about dbol only and inject.