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.
A matter of time control.
That's how I play teemo as an amazing solo mid laner.
If you succesfully use your skills, especially by waiting the right moments to use'em, enemy's will always be disturbated cause you have the control.
Once lvl 6+, shrooms well placed (dragon, mid left-right and all above the lanes) you and your team will own teh map.