Burritos can have any veggies in them, but rice and beans are a staple in most. This version listed veggies that rarely show up in burritos while omitting basic ingredients associated with burritos.

It's like if they made a vegetarian spaghetti, omitted tomatoes, and instead added peas. Like yeah, peas are vegetarian, but it's not exactly part of pasta.

A lot of restaurants do this for different reasons, usually to half-heartedly accommodate people who don't eat meat.