This mod

Wow.

Recent updates of TF2 has broken that mod though (from my understanding).

It works! And it's freaking awesome.

The server you were on most likely has its own custom version of it, or even probably made from scratch by their developers. The public version that lies around sourcemod.net probably doesn't work from what I have heard.

The one on the server I played on was made by Darkimmortal.

Remember playing this a little while back, but that version wasn't that good.
There you lost health as pyro every time you used ammo. So you couldn't just run around spraying, but the props ran really slow. This way is much cooler, that you can fire as much as ammo allows, but the props can outrun you.
I remember being the control point once. Damn that sucked, especially in a level with only 1 control point.

hide on roofs as control points! for some reason the underside of it is transparent so they can't see you from below you :p

Love that Mod