And you posted this on garrysmod.com why?
I think more than 50% of the people that plays GMod has CSS so some on GMod.org might notice his map and use it if he maybe has a CSS server. Also these/this maps works in GMod aswell do someone that might have a deathmatch gamemode can find this useful.
Plenty of people post their CSS maps on GMod.org.
For the OP, I suggest you maybe also upload to fpsbanana. That's mainly CSS maps and such.