Those ideas seem mostly to be composed from various sources, in a mixture soup.
Their punch line is to make identical between Buddhism and Advaita Vendanta. This is totally incorrect.
You can refer to this post regarding criticism of Advaita Vendanta.
It seems that Ken Wheeler is probably the one who gathered from various sources and promoting such a soup. There are plenty of criticisms of Ken.
Note: About a month earlier, someone has already raised a flag about this Ken and the forum members have already given feedbacks.