Which it does. A Pokémon can only have one of Sleep, Confusion and Paralysis active at the same time. Each condition requires you to rotate the card a different way, so they cannot coincide.
Even if it didn't your math is wrong - Ninetales does 170 damage with 3 special conditions on the opponent, which would be 180 after poison (or 200 with Virbank). HTL by itself does not add 30 damage to your output like your math assumes!
Even if it didn't your math is wrong - Ninetales does 170 damage with 3 special conditions on the opponent, which would be 180 after poison (or 200 with Virbank). HTL by itself does not add 30 damage to your output like your math assumes!