Onyami
I took a look at your vid clip concerning the "Li Pi" form in question. Answer to that, being a ba bu practitioner... this ain't Li Pi. (You can call a duck a chicken all day long, but at the end of the day, it is still a duck.) The Li Pi form comes from Eight Step and Wu Tang. These two styles are very close to each other regarding the form. Even when Seven Star performs Li Pi, it does follow fairly closely the form.
I see a few remotely similar movements thrown into this man's form such as the clapping of the hands together after an elbow strike representing ba bu's catching the nape of the attackers neck to bring him off balance and forward into a kick, then there is the turning and dropping into a horse stance with an elbow to the kidney and finally near the end, there is the rear leg sweep with a backfist in there somewhere and something similar to our closed door kick. These minor things certainly don't qualify this form as Li Pi. I had to watch this clip multiple times just to catch small items that resemble the Li Pi form.
In all actuality, the form isn't really as big of an issue as the way it was being played if you really want to know if it was BaBuTanglangquan. Forms can vary somewhat depending on how you are taught, but the essence of the style of martial arts is the main thing. Ba Bu has soft style roots coming from Hsing I, Baqua and Taijiquan. These have to be present to represent the style no matter what. You can imitate the form or modify it but without the reasoning behind the movements/techniques it is void. The man in the clip is a hard stylist and looks as though he inserted some items from Li Pi into his style form. This form really looks like a Frankensteined form in my opinion. I noticed a few similar items to other martial arts styles thrown in. These things by no means indicate that he is not a good martial artist, it just means that maybe he has developed his own style from mixing things up in a way. No matter what, this cannot and never will be Li Pi and by no stretch is it at all related to Eight Step Mantis.
Good luck to you Onyami~
"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
Benjamin Franklin