Thats not how OS RAM usage works. I can’t find one definitive source. But on no modern operating system can you just blindly look at RAM usage by the OS and subtract that from the amount of physical RAM and say that is what is available for applications.
Depends on which metric do you look, right? :)
Honestly, I don’t know which one to look at and was purposefully hand wavy. I just knew they were looking at the stone one…