I'm failing to catch all the references, could any of you ellaborate? Perhaps my 24 yo mind is not experienced enough

There's a South Park episode about collecting underpants for profit. The episode goes - okay it's a 3 step plan.

Step 1: Collect underpants Step 2: ????? Step 3: Proft!

So he's joking that these guys have figured out the step 2 finally, so the gnomes can profit from collecting underpants.

Huh, I've gone many, many years knowing the meme, but not until today did I know it came from South Park

Not really safe for work. Enjoy.

https://youtu.be/WpnM37A4P_8?si=SSRvgD4yvhAcdh0e