It is very possible that it COULD be Pan nam wing chun which is very similar to the Ip Man style of wing chun. Pan nam DOES NOT USE THE TEN CONCEPTS like modified wc. So this could be a possibility. Funny, though, how he WON'T mention his lineage, almost as if he is ashamed of it. But one thing I WILL say about Master Wong. He is a great teacher, and one hell of a funny guy! You can and should use his tutorials, along with others. Not every master knows all the subtle details of wing chun, so I recommend you do as many tutorials as possible, even from modified masters like Moy Yat. Sifu Wayne Benonha has great tutorials. He is a student of Moy Yat and his techniques are pure perfection. The only thing I DON'T like about the modified style is that they use that crappy 70/30 stance instead of a 50/50. 60/40 stance they use in traditional. This causes your energy to go BACKWARDS instead of FORWARDS (Which is one of the principles of wing chun, to ALWAYS MAINTAIN FORWARD MOMENTUM), causing your energy to be overrun by your opponent very easily and also can push you backwards, off balance. I also recommend you do as much research as possible. There are books out there that will help you understand more deeply the concepts and their proper application in a fight. This is very important if you want to become a great fighter! Just stay away from ANY tutorials by Leung Ting. He is not very good and not a good teacher, even though he IS very charismatic!