I'd say yes.
However, it would depend on overall subject. For example, Can you achieve sufficient daily complete proteins as a vegan if you only eat grains, fruits, vegetables and other whole foods?. This question is about nutrition as it applies to veg*nism. (on a side note, I like that shortening of vegan/vegetarianism)
However, look at this question: Is boiling orange or lemon peels and drinking it as a tea healthy?. This question is about health benefits, but it serves as an example pretty well I think. This is not about veg*nism, it's about the health benefits of a food that happens to be veg*an.
Take an imaginary question: "How much vitamin B12 does your body need to live"? I'd say this is off-topic. It's certainly applicable to vegans, but it's equally applicable to non-vegans. If you don't like this example, swap out the B12 part for calcium. Yes, it can be harder to get both of those nutrients as a vegan, but it's not specific to veg*nism.
TL;DR: yes, as long as it's about how nutrients relate to veganism, not about nutrients in general.
Related, regarding my stance on this. I believe nutrition questions should fall under these guidelines.