First off, make sure that you have OneSync enabled. Verify this in the TxAdmin settings.
If OneSync is enabled, make sure that your anti-cheat is not blocking the props from spawning. We recommend upping the odds of the loot spawning in the config
I don't see any parked vehicles at all
The script does not spawn vehicles of its own. It relies on ambiently spawned vehicles, so if you have a script which prevents ambient parked vehicles from spawning. You'll need to tweak it to allow spawning of parked vehicles