Brown rice isn't that good for you. Although if you remove that (or at least tell them to do 'light' rice) and add the lettuce, one of the salsas and the fajita veggies instead it starts getting pretty healthy (at least as far as I know).
Based on what, exactly? Japan has one of the highest average lifespans, and the healthiest demographic in this already top-of-the-lifespan-pack nation consume significant amount of white rice, let alone brown.
https://doi.org/10.3389/fnut.2023.1209574
Many foods can become toxic in excessive quantities. That's why it's best to eat a wide variety of different foods and not get too many calories from any one food. Everything in moderation.
You also can wash your rice to remove 90% of arsenic, basically putting it to wheat and other grains levels.