My thoughts remain the same that all m4 series have varying degree of coil whine.
Most of the time it won’t be a constant sound. For example with the m4 air, it’s extremely shrill and high pitched when you first run the command in the OP, but eventually it goes away as the chip throttles and heat builds up.
In real life, it can still be annoying though. For example when I open certain heavier apps on my m4 air, I can briefly hear the frequency come and go. Or if I copy a large file to the Mac SSD, same thing.
I think we’ll have to learn to live with it and understand it’s a trade off they’ve made with this new series.
I’m not saying m4 units without coil whine don’t exist, just that they are most definitely the minority, and most (if not all) have coil whine to a degree or rate not experienced on earlier series.