They probably didn’t mention it because, like you pointed out in the sentence immediately after your question, it makes the philosophy ill-formed and dare I say

They probably didn’t mention it because, like you pointed out in the sentence immediately after your question, it makes the philosophy ill-formed and dare I say uninteresting. Are languages real? Sure, I guess. Why not. They’re made of concrete sounds and symbols that everyone (by design) can point to - they might even be the realest thing there is. Are (math) concepts real? As in like, if I rearranged all the matter that exists out there, would the value of root(2) stop being irrational? Or maybe they don’t have to be physical to be real; maybe being “real” has more to do whether or not something has an effect on something else than its physical existence. Then, there’s a difference between how something exists and how real it is? Etc. Thinking of math as a language as opposed to a set of concepts isn’t interesting to the discussion of its reality IMO