Team Comtress 2 is a fork of an older version of Team Fortress 2, with a community development team fixing bugs, improving performance, and adding quality of life features, with the goal of having those changes pulled upstream by Valve to the modern game.
Seeing as how they are basing their work on a leaked (stolen) version of the TF2 source code from Valve, I don't see this project even existing for very long, much less contributing anything back to Valve.
