This plugins removes all those flying souls in your server when the cvar 'tf_forced_holiday" is set to 2 or 9 or something else.
No cvars, just put this plugins into addons/plugins folder and type '!rcon sm plugins load disablesoul' in the chat.
All credits go to Take 2 , I did not create this plugin, just uploading because he cannot speak or write in english. Got his permission of uploading this.
If there is a same plugin which does the same thing to this, or if this (me uploading it instead of him) is against the rule, I will remove this asap.