it's a long story . . .
but in short, Libby pumpkin pie filling is not made from "pumpkin"
almost.
technically what pipples call "pumpkin" is a squash.
but for pies/taste etc there are better squash candidates to the purpose.
nor is Libby is some huge conspiracy to hide that fact.
see
LIBBY'S Pumpkin History - NESTLE VeryBestBaking.com
I think you're going to have to give the "long story" you mention above because your post doesn't really make sense. As wyogal pointed out, we are talking about canned pumpkin... not canned pumpkin pie filling. And I don't think anyone is saying that pumpkin is not a type of squash. However, the link you gave actually says the opposite of what you are saying in your post. I'm not really sure what your point is, but I think most people here agree that canned pumpkin is actually better than fresh and equally nutritious.