iirc, Pokémon and Human relations were actually canon in some of the DS games, but only in the original japanese version. For the US version they changed some words to be more like: "Back in the day Pokémon were more closer to humans, they ate in the same table, did the same things and were good friends". But in the japanese version they basically said that humans would date and marry pokémons.

I still think it's fucked up what they wrote in the leaked doc, but I don't think they should remove Typhlosian for something that is not even canon or appeared in any game or media. But knowing Nintendo, I guess Typhlosian is going to get the Porygon treatment, and never show up again in any bigger role other than some random pokémon.