Ugh. I said I was out but I'll respond to this.
There are absolutely guys who can bench twice their bodyweight and are not on steroids. Several post on this site regularly. It's especially do-able for short guys.
I grew my arms substantially more than 1 inch without steroids. I'm guessing I put about 4 inches on my arms, as an adult, without steroids. 1 inch is ridiculous. Starting point is very relative here, as is bodyfat. This website has to be a joke.
Why would deadlifts be useless? In what context? If your goal is to lift heavy shit off the ground, I'd say deadlifts are a pretty effective way to practice that. And if you compete in powerlifting, you have to deadlift.
To call the above things 'theories' is truly rubbish. These are hard facts.
I don't know if Gironda used steroids or not, but I can tell you that athletes began taking steroids in the mid 40's, and that testosterone was first synthesized in the 30's. So by the 50's, they were quite prevalent. By the time Gironda was 30, they certainly would have been available to him. I doubt he used them before he was 25, but anytime after that, it's impossible to know for sure.
Here's the real question though. Why do you care if Gironda used steroids? Does it matter at all? Does it affect you in any way whatsoever?