Sweet! Yeah, I think you've answered most of my questions -- enough to have a very basic understanding of it, anyway. It's always better to know than not to know, that way you can appreciate both the similarities and differences, and appreciate the approaches where they differ.
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I'm not super well-informed, but the basic idea behind #PermaComputing is to be the very opposite of the upgrade treadmill -- to have a system of computing that does not have to be upgraded every year, or even every decade. To have software tools that can run on any kind of hardware you throw at it, from 16-bit microcomputers to handheld game machines of today and yesteryear, to raspberry Pis and even modern machines.
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R. L. Dane 
Crunchysteve