Oh im so so sorry, i didnt test yours, but turns out the code i had written
timer.Create("motd", 600,0, function() RunConsoleCommand("ulx", "cexec", "*", "ulx", "motd") end)
worked
thing is that since i edited via phone and stuhf, it wasnt saved properly on the server.
Thanks anyways for your help
P.S: I have something similar also, i want the same command, but implemented for gmod_admin_cleanup. i tried the above. doesnt work