Not quite.
As I noted above, with the Delta variant, viral loads in the upper respiratory tract are orders of magnitude higher than with the original strain, even though symptoms are not much worse. So, with Delta, the exhaled vial loads may still be much lower for vaccinated people, but that may not be low enough to prevent spread.
Also, while masks are mostly there to keep your viral particles in, it has been clearly shown that properly wearing a mask does give you some protection against incoming particles. The vacine works well, but it isnt' perfect, and layering this protection helps keep you safe from breakthrough infection.
Also, it has become obvious that there's value in normalizing mask-wearing. Most places cannot enforce "only unvaccinated need to wear masks". They can enforce "everyone wears a mask". So, there's value in telling vaccinated people to wear masks, if only because that increases the number of unvaccinated mask-wearers, too.