We've seen it happen before with nuclear weapons, but it's unlikely that humans would be able to reinvent the exact same object with the exact same name in such a short amount of time. And even if they did, it definitely wouldn't be common knowledge so neither Asa nor Denji would know what to call it.
One would think this is a reference to the fact that Pochita wasn't really the Chainsaw Devil, which could be a clue towards understanding where his erasing ability comes from, but the astute reader will notice that this is in fact a sign that Fujimoto couldn't give two rats' asses about the ending and just wanted it to end on the cheesiest title drop in existence, because he stopped trying to make his own manga make sense a long time before I did.