You are correct that there is no evaluation of level of support, and it is hard to get evaluation set on 86 languages. On the other hand, we can try to extrapol

You are correct that there is no evaluation of level of support, and it is hard to get evaluation set on 86 languages. On the other hand, we can try to extrapolate from what we have and try to guess in which languages we'd have reasonable performance. Note that out of 19 languages it was evaluated on only 17 were "officially" in the training set (language detection is not perfect and there may be some data for languages not included in training set) and it work reasonably well on the remaining two (Swift and D).