damdao

Wudang daolus contain internal work comparable to that of Yuxianpai—at least in the forms that existed prior to the Chinese Civil War. Whether this remains true today is uncertain, though not entirely unlikely. It’s also possible that Wudang practitioners adopted external martial forms and later infused them with internal practices. Some teachers have suggested that internal styles existed even before Taijiquan, as Forestgreen mentioned—such as Xiantian Quan and other systems now lost to time.

I don´t know Oscar personally but he is very approachable so you can write to him and ask him many things about his system. He interviewed Matyas Dally, so you can find the video in his site or channel (I don´t remember where).

Besides the links above you can contact Robert Coons https://www.facebook.com/daoistmeditation and Oscar Idelji https://thenuwa.substack.com/p/the-essential-teachings-from-the.