Well, until we can figure out why the Overrides aren't working for you, let's focus on the other issue.
What errors are goomba.inc giving you when you attempt to compile?
Code:
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(4) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(23) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(25) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(28) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(33) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(36) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(38) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(49) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(51) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(53) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(56) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(66) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(69) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(71) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(76) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(83) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(92) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(95) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(101) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(105) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(127) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(139) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(145) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(149) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(152) : error 010: invalid function or declaration
/Gameservers/TF2_0004/orangebox/tf/addons/sourcemod/scripting/include/goomba.inc(154) : error 010: invalid function or declaration
Compilation aborted.
26 Errors.
I got the source from his site so it should be the right one.