Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
I think playing AP teemo is a little more difficult than ad/as teemo as it is completely based on mushroom placement and your ability to deal damage without taking any yourself. So if this is your first or second time playing teemo, I'd suggest using an ad/as build first and get used to the mechanics before trying AP.