Just wondering why IGT has been archived in Lost in Nightmares but isn't for individual level runs?

In a nutshell, it's mainly for accessibility.

We archived the IGT timing method for Lost in Nightmares because it was simply an outdated timing method, and we have something that's better as a whole now. As for individual levels, I think they're short enough that it's fine to keep something like IGT unarchived. I know Lost in Nightmares is also a fairly short run, but the amount of grinding people do at the start of it to get a grenade isn't something that should be trampled on if they accidentally do a reset that would be deemed "non-tactical".

That makes sense, was just wondering as me and a friend decided to do a couple runs to see how we could do and got 8:36 IGT and got excited that we wouldn't be last xD Good to know that it isn't an issue with it as a timing system as I know that some games have dodgy timers in game. Thanks for the answer :)