SPRT (Space Pirates) is currently the ONLY available NPC faction besides the Space Spiders, so as long as you don't play on a dedicated Server, SPRT will be the only One you will meet.

If you are able to select Ships like the 'Pigeon', when died, or at Game Start, the mod is working.
If you have Cargo ships and Random Encounters enabled everything should work out and you should come across a large amount of SPRT contacts.