I think it uses a modified TBDev, this is really old script not updated ... Much older tracker still uses this script.

If you are looking for a script you should use gazelle with ocelot (or gazelle modified) otherwise u232 is good but it must absolutely added xbt tracker because it is too heavy without, there is also bittytorrent that looks not bad...

If you want to support millions of peer you must absolutely use xbt tracker no matter the front-end (xbtit,tbdev,u232, etc.) back-end of gazelle is ocelot is modified xbt tracker