I've removed the older chapter. In the future, it would probably be easier to just ask the old TSer to unapprove/rename his upload. All it takes is a couple clicks
The issue is that the old TSer didn't exactly leave on friendly terms, and has a lot of pride tied to this stuff - hence why we had to change names, for example.
Also, as I've explained on Discord, duplicate chapters aren't the problem here. You (correctly) uploaded the new version of chapter 1000 as an archive, which sets it's upload date to be 1970. Only chapters uploaded in the last couple weeks are viewable by logged out users, meaning that's why it doesn't show up.
Sorry - looks like it's been reapproved?