There is no DHCP, it’s all static addresses, but there is an ARP table maintained at the router, and modern routers protect against ARP poisoning, meaning the same IP cannot have two mac addresses, and they will churn out errors. It’s also a security nightmare because many low level packet tracing tools will not work or give out false positives. I still don’t know how it’s working for you, because by all accounts, it shouldn’t.

I don’t know how it’s working for you because I just tried on my PC and got an IP address conflict on my router.

I use PikaOS, which is based on Debian. It’s right up there with CachyOS is performance and gaming, and have been using it for over a year with its hyprland variant.