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A large number of microcontrollers are ARM based, which isn't Harvard architecture. I presume the thinking is that there's some massive number of Harvard architecture chips in mundane things that lets us say "most" are Harvard arch?

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ARM Cortex-M is a harvard architecture microcontroller. What ARM Cortex-M has in common with ARMv8 are the letters "ARM".

Some Cortex-M cores are described as Von Neumann. It varies by specific sub-architecture within Cortex M.

"Modified" Harvard though. The M0 has unified main memory, so JIT wouldn't be immediately ruled out.

Many ARM microcontrollers have Harvard architecture as well, for improved interrupt latency compared to plain Von Neumann.

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