Philosophy absolutely has lots to say about intelligence, much of which is mutually contradicting. There are a lot of different models out there, based off of varying levels of cleavage to various priors, that all seem to have very little real explanatory (or, I should say, predictive) power. Approaches based off of current materialist, biology-based methods have a little more utility behind them as far as we can tell (some of our drugs seem to do something to the mind), but the furthest they've gotten so far is to be able to figure out some of the things that matter to intelligence, rather than a successful general model for what it is.

And while I'll agree that this lack doesn't necessarily preclude the ability to reproduce intelligence, it does make it darn hard to recognize it.