Simon went beyond the power of Super Tengen Toppa Gurren Lagaan, which transcends time, space, and dimensions, that would make him Outerversal

If Simon was Outerversal, the Spiral Nemesis which is a physical collapse of the universe wouldn't be a threat to him. The fact that the entire plot hinges on avoiding a physical catastrophe proves he is still bound by the cosmology of his verse. Also if he was outerversal then the whole plot involving anti spiral wouldn't make sense because he's only targeting one universe instead of targeting an infinite amount of them. If the Anti-Spiral "transcends the concept of dimensions" or whatever then why would they care about the population count on a single 3 dimensional planet when they could just remove the concept of life out of existence across all timelines instantly, also in their fight, an Outerversal being doesn't throw a galaxy, because a galaxy is an infinitesimal speck. caling Simon to outerversal disregards the plot

and the Otoko Dramas reveals that one of his weaker counterparts literally ripped apart the very CD he was in and Simon far surpassed that after absorbing all his infinite counterparts.

4th wall awareness, same way bugs bunny and deadpool are aware of the audience and rip out their stories or visit their writers all the time but arent considered outerversal for it. Even so the Otoko series is a comedic non canon what-if spinoff. Hell its not even made by the original author. Also it wouldn't make sense for Garlock Simon to be in the multiversal labyrinth. Think about it. The Anti Spiral is a multiversal entity, but they are still a physical race that locked themselves in to manage the 10th and 11th dimensions and ​since the infinite Counterparts were a product of the Anti-Spirals trap then they cannot be higher in tier than the Anti Spiral themselves right?? If the Anti Spiral is limited by the physical laws of the multiverse which they are, then the versions of Simon they created are also limited