Are you defining microtransactions as DLC? That's a pretty general term if so. By that logic just about all games have microtransactions then.Forza has MTX. Micro Transaction is a small transaction. There’s numerous one time purhcases for small amounts you can make to make the game less grindy/monotonous. It also has large scale expansions.
GT7 has more MTX, but that doesn’t change the fact that Forza also has them.