dedicated to the discussion of the chinese internal martial arts of xingyiquan, baguazhang, taijiquan, related arts, and anything else best discussed over a bottle of rum
Although I don't practise it, the form (especially the rhythm and footwork) seem somewhat reminiscent of the baji I have seen that was passed down from Li Yuanzhi. (I have seen this referred to as Li style...not to be confused with Li Shuwen, of course). I believe Li Yuanzhi's main teacher (for baji/pigua) was Ma Yingtu. As to the pigua, I have never seen any of his style, so I can't say whether that would confirm this supposition.
I see the movements from pi gua, xiao baji, da baji and baji linking form in the various applications - the one applications uses the 45 degree kicks found in the opening of the xiao baji I have been taught and practice. However, there are variations in the forms and applications that are different (I like what they do).
If I am not mistaken, he originally practiced Wutan baji, but reconnected with his family's baji on the mainland later. Hence it looks similar but different. Likely his approach is a hybrid.
It's Ji style Baji and Pigua (季式八極披掛) as taught by Master Ji Zhaohua 季昭華. Master Ji was a student of Liu Yunqiao and later went on to study Ji style Baji passed down by his great grandfather Ji Yunlong, a famous Baji master.
Among all the Baji guys who teach openly in Taiwan, I like his style the best in terms of apps.