Parts of it are. The kernel is derived from a Mach microkernel (an experimental kernel in the 80s, which was theoretically supposed to allow different OS personalities to coexist in the same system, sharing resources; macOS’ Darwin/XNU kernel doesn’t implement this capability in full, but you do get the Mach Ports interprocess communication mechanism, and a BSD UNIX personality permanently attached).
Murdering your wife is one of those things that, no matter what else you achieve in your life, people will say “there goes Hans the wife murderer”. Even if you only ever murdered one wife and have shown no signs of making a habit of it.