If the Wamapoke were so thrifty, I imagine they ate most of the pioneer's body. Why not go all the way and describe them as cannibals?
The captions for the hearing impaired indicate that the script originally told of a different exchange:
This prologue is unrelated to the story that follows. It's completely gratuitous. Including the website and the previous episode I mentioned, it's the third time Parks and Recreation has described Indians as murderous savages.
Judging by the "jokey" tone, the show's writers must think it's okay to make fun of Indians because they're no longer in Indiana. Although Indiana doesn't have any recognized tribes, I think it has several communities of Indians descended from the Miami, Shawnee, Potawatomi, and other tribes. Imagine watching the show and hearing that one of your relatives cut someone's face off.
For more on the subject, see TV Shows Featuring Indians.