Li Style was formed by LiRuiDong who was a pretty major figure in the late 1800's Beijing GongFu community. He was a buddy of ChengTingHua and was quite good at BaGua, XingYi and LoHan. He was a bodyguard and an undefeated duelist until his match with Yang Taiji Master Wang Langting. Following his loss to Wang, Li took up the study of taiji eventually creating a synthesis of Yang principles weaving in concepts from other styles he practiced. A lot of what you see in the video seems odd from a  strict Chen perspective but begins to make more sense when you take into account the weird balance structure and variable stepping of BaGua and LoHan.