Cultural appropriation refers to the use of objects or elements of a non-dominant culture in a way that doesn't respect their original meaning, give credit to their source, or reinforces stereotypes or contributes to oppression. - Google
The problem here is not invention. The problem here is that aliabramovitz and company "like to stay away from those [theological] aspects as it can be off putting for people who don't subscribe to a certain philosophy or theology", in a subject matter where the original theology is a core part of it, and that too a theology that is not aliabramovitz's own theology in order to cater to people who dislike the theology of the original owners of the practice.
So no, white people stealing other peoples practices and bastardizing them !== Invention necessary for the world to progress.
It is simply stealing and removing the original in order to cater to Abrahamics and to make money.