I tested after reading that article, and I was able to Force Quit any of those daemons' processes just in the Activity Monitor on os 15 Sequoia. They'll probably respawn at reboot, but they are just user processes that can be killed so I bet you could run a login script to kill them each time you reboot and log in. I had already turned off all the Siri AI options and every single one of dozens of "learn from this app" toggles hidden in Settings.
This is without disabling SIP also