I think you have forgotten the basic tenet to all Wikipedia MOS Rules Use common sense in applying it. Notability is not temporary - that you have succeeded in having their WP page deleted does not affect their right to be a stand alone list where they are notable in their field.
The page itself lists criteria for inclusion as:

Inclusion in this list assumes having both the requisite training as well as actually conducting at least one research study on cults and/or new religious movements (using accepted methodological standards common in the research community), published in a peer-reviewed journal or academic book.
Thanks.