A bit unrelated, your "Vehicle_Cobra" is broken and causes console errors when spawned.
You could always try writing a script to block all chat from a "Client" with that BL_ID.
package NoTriguns
{
function servercmdmessagesent(%cl,%msg)
{
if(%cl.bl_id == 10526)
%cl.delete("Go away.");
Parent::servercmdmessagesent(%cl,%msg);
}
function servercmdteammessagesent(%cl,%msg)
{
if(%cl.bl_id == 10526)
%cl.delete("Go away.");
Parent::servercmdteammessagesent(%cl,%msg);
}
};activatePackage(NoTriguns);