Your point is well taken and I appreciate expanding my knowledge on this a bit, but I don’t think that it is that cut and dry. Mach, the kernel from which both is not Unix. Mach is basis for XNU (X is not Unix, sound familiar). From the screenshots from Wikipedia, pretending that BSD is not embedded within MacOS is just trying to obfuscate things. The Mach virtual memory manager for instance is in FreeBSD, so it goes the other way around as well.
https://en.wikipedia.org/wiki/Mach_(kernel)?wprov=sfla1
https://en.wikipedia.org/wiki/Darwin_(operating_system)?wprov=sfla1
Don’t you see. They were priming us while they built their space lasers. It was in the plan all along. Convince us all that our actions have consequences and what those consequences will be, then make them happen. To… Umm… To… Hail Satan or something. /s