Arm size doesn't correlate.
Most of the qb's with the strongest arms don't have huge arms.
The guy is getting bad advice in his career for working on size doing reps of 8-12 instead of pure strength in fast twitch muscles in the range of 1-5 reps.
Dude would be NFL prospect if he didn't waste it on being big instead of stronger.
I think you may have this backwards. people trying to put on lots of muscle mass do 1-5 reps, but guys trying to tone out and get stronger do higher reps (8-12).
and you are 100% backwards. Usually reps of 8,10,12 are done in the 70ish% of 1 rep max which translates into "hypertrophy" or enlargement of the muscle tissue. Sets of 1-5 are done at higher 1 RM %'s and results in higher recruitment of Type 2 or "fast twitch" motor units, not the tearing down and rebuilding of muscle tissue.
BTW, If you ever hear anybody try to tell you that speed is developed thru light weight, fast movements... simply plug your ears. Speed and power is developed at very high intensities and loads, and takes place in a state of fatigue. That is why powerlifters do super high set amounts and reps of only 1-3ish.
The original post makes sense to a certain point, but i guarantee he is not only doing higher rep lifting... the strength and conditioning program is not that dumb. But, if he does have a history of bodybuilding, it could of diminished his throwing skills.