Well, my response was and is that natural bodybuilding means different things to different people, but it always means No Steroids. After that point, it depends on the individual or the competition in question to set lines or definitions. If you are using supplements, yes. If you are using steroids, pretty clearly, no. A few good meals or a thorough warmup can produce the same sort of effect.
Steroids vastly increase the raw work capacity, period.
For this list, I think it is pretty safe to include caffeine as an ergogenic aid for all natural bbs. On the other side, I have not ever told anyone to use clenbuterol, nor will I if it is illegal. I do not understand what it is or does. Someone is welcome to post an explanation of it, but that does not constitute an endorsement of it, by them, me, or the list. Ephedrine is a bit more complicated.