If you're going to make such absolutely ridiculous claims, please at least provide real proof. The least you could do here is record it. That "log" proves nothing and there's no way to know that's your actual log that was produced.
It's definitely not a 1% chance, though. I don't know why it says that on the wiki and on Allakhazam (however, on Allakhazam the first post explicitly mentions that the mem blur rate is much higher than 1%).
This site from 2001 claims a 95% chance of wipe (
http://web.archive.org/web/200105050...asp?SpellID=20). Other websites I'm seeing from early 2000's claim that mem blur success decreases as the NPC level increases. I just tried it out on an ape that was green to me in emerald jungle and it blurred 4/10 times.