This is not new, classical Theravada has been preserving this for thousands of years.
We are repeating things by now, since you didn’t want to read all the past post.
Sphere of nothingness still has perception. Then go further perception is mostly gone for neither perception nor non perception, then go further is ending of perception and feeling.
That cessation of perception and feeling is temporary samadhi for arahants and non returner while alive and in that, there is no mind. But after the arahants die, it’s no longer temporary.
There’s 9 levels of nothingness, so just using the term nothingness can be inaccurate philosophically speaking, unless one is clear about which level it is. Parinibbāna is the highest level.