His lectures doesn't go into details. Each topic is glossed over very briefly with no details. He should explain in more details if he really understood what he lectured.
He basically copied some materials from online, or from somewhere.. Cos the way he used that classification of "Indo-European", he misunderstood those materials written in English !!! Idiot. No wonder China has a lot of problems... in science, and in researches... He should not have stated that. Cos he clearly has misunderstood, and mis-referenced wrongly.... F!ck.