Hey AA. Dig this excerpt from the text:

" ...this is because no rotation was taken in account. A very fast
rotation should be considered instead, and, in the case of a black
hole, there would be only a small kernel, probably surrounded by an
intense energy field."

Does this not perfectly describe the H atom illustration just given?

Notice under 'Conlusions', it talks about "time collapsing near the
Planck mass". This dovetails with your perception of time stoppage (as
perceived by us 'out here', of course) which would give the appearance
of solidness to the **processes** which are atomic particles.
The authors are constrained to operate within
the constraints of the void-space paradigm of course, resulting in a
large amount of mathematical `descriptions` and no real unification of
anything.