I think that might be a minority, most of them are going to use everything at their disposal at (high) dosages they can tolerate.
It's like LATS already alluded to: these guys are mostly doing the same things as the open guys but they don't have the genetics or response to the drugs to make it to open bodybuilding.
Kinda similar to all those fake natties claiming natty status because they have a poor response to PEDs.
I'm not generalizing here just to be clear, there certainly are going to be purists that want to emulate everything they did in the Golden Era.
Ding, ding, ding! This what people don't want to believe. Everyone wants to think they can be in the top 10 at Mr. Olympia. The sport of bodybuilding is more popular than ever which has been happening for decades. This brings more and more competitors, many who fall under the illusion that one just needs access to AAS, GH, etc. and they'll be next Haney, Dorian, Ronnie, Jay, Ramy, etc. This sport is like any other where there's a lot of competitors but the closer you get to the top, the more you're seeing the elite that have the total package for bodybuilding! The people who lack the genetics will push the limits more than the most genetically gifted bodybuilders and think that everyone has to do the same amount. Not to say the top don't push the limits going into a show.
As I've mentioned before, I had a long conversation with Victor Conte and when he was testing all the top guys from the 90's/2000's, the average overall dosage was 3 to 5 grams. Imagine what some of the bodybuilders with lesser genetics are on now!