This is just gossip and opinions doesn't mean the arms ARE dodgy.
During the 80s biceps looked hard and you could see the fibers.
Split biceps, detail near the armpits.
You know the look, water logged, lack of separation, lack of visible muscle fibers. I don't think this is just an issue of conditioning. Everyone trying to catch up with one another with Phil at the top? Except Phil is blessed with monstrous arms and doesn't need big site injections in the arms. He might but it doesn't look like it.
My guess is 5mL shots to keep them up that level. Not year round. Not all the time.
One guy I can think of, tall, when he hits side chest theres no separation whatsoever. Olympia level...