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.