I'm guessing you installed Sourcemod incorrectly somehow since it doesn't recoginize basic sm commands.
Either way I wouldn't recommend installing the jump pack that is in the original post, since it is pretty outdated (Sourcemod 1.8 ) and still uses the rampbugfix that gives you extra speed.
Here's an updated version of the full pack from the original post:
https://mega.nz/file/XWJB2IjQ#i6OJbQKXiqL9NRsa-_Hlx3OiFXkgVaqFoD_RyXniyy0It has everything that was in the original jump pack except:
- Updated sourcemod to 1.10
- Updated rampbug fix plugin (3.0.4) + added DHooks extension to make it work
- Replaced bounce tools with the (live) bounce tools made by ILDPRUT
Copy the folders "addons" and "cfg" to your steamapps\common\Team Fortress 2\tf folder and launch the game with -insecure.
To make TAS work you also need tv_enable 1 in console.