Just in case the questions are serious, I am against this type of explanation as the metaphor used is possibly more complicated than what really happens, which I consider a bad habit (in particular, geologic activity is one of the most complicated phenomena in the world).
Besides, as a non-native English user, I had some difficulty putting the things together and even re-reading it, some concepts appear to clash such as the use of the word layout with cartographic quality but in practice we're just talking about a blob of memory with a size.
It is not obvious in my opinion Andy is referring to layout of the virtual memory address space, in this specific context I consider this prone to misunderstanding.
I also argue that a buffer is never re-arranged as it is in itself a blob of linear memory. It might map to a different pointer (virtual memory address) but its layout does not change in the sense that buffer[i] will always go to the same element of the buffer as long as buffer holds the correct base value, which is always the result of the Map call. I understand this might be a subtle nuance of English interpretation.
I also argue there's no point in ELI5'ing this. There's no need to pull in extraneous concepts. Anyone not understanding mapping does not need a metaphor; they need to re-read the documentation and check their basics.