In your "counter-example", you're running four different userspaces/distributions on the same operating system kernel.
You could have posted a useful clarification to my comment (e.g. "but you _can_ run different Linux distributions!") but instead have chosen to be condescending and inaccurate.
My only comment was in response to 'creating a "clone" of the currently running operating system.' Which is not, in any sense, accurate.
What is shared, as you correctly point out (and I do not refute) is that kernel and devices are not virtualized per container. So you're absolutely right, it's not like a VM. And it does break down, but none of that has to do with the part where your statement is incorrect, which I've addressed and expanded upon.