If Valve doesn't give put out an SDK for linux users to make maps and shit then this is mostly pointless.
(Mostly because getting tf2 decoupled from middleware that is owned by hostile third parties [Havok from Microsoft and Bink Video/Miles Audio which got bought by Epic] is a good thing but doesn't address the current actual issue TF2 has being that there's a drought for developers and the only niggas still making maps for the game are quasi-Valve employees who have been doing it for 10 years now)