We're not talking about Archie Sonic, are we?
Archie Sonic is ridiculous, but unless otherwise stated Deathbattles defaults to the video game version of Sonic Characters
Did they say they were doing Archie Shadow? Or are they doing the same Shadow that got his ass kicked twice on this show already?
Ryuko's durability and regeneration far outstrip anything (normal)Shadow has demonstrated.
You might as well be citing Ultimate Wolverine not dying to a kid whose power s "destroy all organic matter around me" as prof that X-23 (616) is immune to being disintegrated.