Let us examine a selected part of the above writer:
If there is greater containment within, and thus less external-to-the-thing expansionary push, then there is less constraint for the outside to expand, thus it pushes in at the thing.
What he is saying here is simple: when a thing or structure expands or gets bigger, there is increasingly less externalization of it, naturally and thus logically, so the lower constraint that comes from the outside must push itself inwardly - hence conspansion aka inner expansion. Reality is thus nested within reality.
conspansion ... I had to look that one up.
From the CTMU wiki:
In the CTMU, conspansion is the alternating process by which reality evolves. Conspansion is so called because it involves material CONtraction during space exPANSION.
So... it is contraction... why not just call it as such?