Just to confirm, this is correct. Most appearances are account-wide, so any plate transmog you earned on your Dwarf will be available to your Tauren (once you’ve hit the required levels).

The only exceptions here are any faction specific appearances such as some Tier and PvP sets. Obviously, as with the Dwarf, any non-Paladin class specific plate gear (Warrior tier etc.) won’t be available either.

Have fun with the Tauren!