The definition of limitless can mean multiple things as I had sent earlier (well, I assume it went through, I was tired when I sent it, so maybe I forgot to). It can mean no limits or a lot of. Even if we assume the former, it holds true within Sonic's world.
Sure, they could be reading this right now, let them ask their questions. It's fine.
Except its not argument from ignorance and now you're misusing it. I EXPLICITLY stated there's no proof that it does or DOESN'T exist. You're committing the proving non-existence fallacy by trying to make me prove the non-existence of something:
https://www.logicallyfallacious.com/logicalfallacies/Proving-Non-Existence
You're also committing proof by example fallacy by assuming that since some examples of concepts existing in Sonic means EVERY concept exists in Sonic which is entirely irrational reasoning. In addition, you're using argument from ignorance fallacy yourself by assuming that since there's no proof they don't exit that they must exist.
Sure, some authors who don't care much about the lore of their story will say yes if random people tweet them random questions about cosmology if they know a little bit about what is being mentioned. I agree. Which is what I feel makes them less credible, similar to people harassing people who worked on Dragon Ball stuff for random stuff they don't care about or know little about.
It's an answer talking about Sonic's world to a question relating to Sonic's world. It's very much logical to assume it was in reference to Sonic's world when both the question and answer were about Sonic's world. I feel you'd need to be discord debate goon (which is understandable, its funny to do) or be someone who really cares about wanking Sonic to the highest level possible to think otherwise.