[iahwrites]

OP here... yeah it sure looks like it is!

I hadn't heard of it before, and will need to do some more reading, but at a high-level it does look to be the same line of thinking.

[ttctciyf]

You might also like to check out Greg Egan's Permutation City[0] which (in the form of entertaining scifi) presents some related arguments about the need for a computational substrate, or lack thereof.

0: https://en.wikipedia.org/wiki/Permutation_City

[Trasmatta]

Cool! He has some books on the topic that you'd be interested in.