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Yup

It's cellular automata all the way down.

Yes: https://www.youtube.com/watch?v=xP5-iIeKXE8

In this case they're running lisp running in VarLife running in the game of life.

This Varlife is simulated using the OTCA metapixel, which was designed to run the game of life inside the game of life, though it is more general and can therefore also be used to simulate VarLife.

Yup. https://www.youtube.com/watch?v=xP5-iIeKXE8