I'm so confused now as I'm trying to understand why you answered that way 😅.

But, if I understood you correctly, you didn't refer to Silverblue and Kinoite as immutable, because it is possible to apply changes to them and these changes will even stick through reboots etc. Hence, you don't deny that some parts are (in fact) deniable, but find that Atomic simply better describes what these distros actually do. And thus are better suited to set up the right expectations.

But, allow me to ask the following question then; do you think NixOS is immutable?