Yes. He's always used kicks with his right leg more often.
When Thompson goes southpaw, dealing with a guy that can kick off the lead leg like him is very difficult. You can be very sneaky with lead kicks if you have the skill Thompson does. Just watch how he landed that lead side kick to the body and then the lead kick to the head vs. Hendricks, just beautiful to watch. He just pokes you in the face with it. Reminds me of Superfoot Bill Wallace, that lead kick just comes out of nowhere. There's no wind up whatsoever and that helps with disguising kicks more effectively.
Luke Rockhold is also very good with lead kicks, great dexterity and such.