Okay, let me get this straight. Only Body and Soul were erased right? So ONLY parts of Rimurus existance were erased yeah? Let me give you an example as why this is a problem. If i erased your body but let your head intact, would that qualify for Low Godly regeneration? No, because that does not fulfil the requirement of regenerating your entire physical body from a spiritual source.
What you are doing is assuming Rimuru can regenerate despite lacking the most important thing here: Feats. Rimuru has not regenerated from that level of erasur in his entirety, he was not purged down together with his entire body of information. To flip this point for clarity, if a erasur that exactly erases 99% of Rimurus existance together with his Information body, that would still not be High Godly, because 1% of his existance remained from that he can regenerate from. This is why i need a concrete statement of Rimuru being capeable of regenerating despite a lack of Information. Anything else is a higher level of Midgodly.
And the reason why leaving no traces is vague is because it can multiple things. If i erase a rock that leaves no traces, does it mean i have automaticly erased the rock on a conceptual level? Of course not, because you can infer anything from that sentence. Maybe i have erased the rock down to its concept, maybe my erasur leaves smaller particles around and i was really throurough this time, maybe i have erased the rock through time and space. We are not supposed to do the mental gynmastic for the author, either there was a statement from which you can infer a prober and most likely interpretation or you dont.