I think it's important to point out that you can't put out a hypothetical situation whose solution depends entirely on the details, and then tell us to "forget how unpractical a situation is".
Are we talking a chain of button commands that, regardless of level design, causes sonic to warp to the goal ring? Are we talking about a glitch that ends up being a major OOB shortcut that's found in every level?
You are trying to posit that there is some glitch that, by means of complex button pressing glitches, finishes the sa2 level.
I can't just -throw- out details, they are crucial to the answer. Since it is impractical for this to be anything except a glitch that, according to no use of sonic mechanics, finishes the level instantly, I'd have to say it would probably be banned. This glitch would have no competitive value, and, despite the parallels you're trying to fabricate, would be a very different case from sonic r.