Kenko does have an archive of the forums, but IIRC, it's not public anywhere because of all the damning evidence and people's cringey/edgy/angsty pasts that exist on here
I'd wager most users who were here that joined before they were adults said something stupid, angsty, or cringy they'd like to forget. So I don't see why Kenko would find that a good reason to keep it off the internet, as I doubt anyone who views anyone else's past really cares that much.
If someone like Iban can dig up the evidence against him when he was a teenager and broadcast it live to his entire audience I'm sure everyone who ever posted here can face the stupid things they've said and done when they were 12 years old.
There's also risk of the entire history of forums being potentially lost if it's left to just one archiver.