To be fair, some of the languages listed there are likely just the documentation (HTML, Jupyter Notebook) and some are only there because Tensorflow provides an API for that language (Go), so not all of that is needed to get Tensorflow working on iOS and in Pythonista. The main issue is probably the C++ code, but since I don't know anything about Tensorflow or C++, I can't really judge how hard it would be to port that to iOS.