They use
And yes, there is another way to get ghostmode without GM commands.
Use CE on a server where you can use ghostmode, scan boolean 1 for ghostmode on and 0 for ghostmode off. Find the pointer of the ghostmode address, so it would work on another servers. Use the cheat table on another server and change ghostmode value to 1.
I didn't test this myself, but I gave this idea to 1 friend and he said it works.