Let's try the opposite. Say someone got Wine working to the point where it was very nearly, perfectly indistiguishable from Windows and they put up a blog post saying "Everything works just as it should under Windows, because it is Windows." Microsoft's lawyers would come around with a C&D, and calling them pedants wouldn't invalidate their case.
He could have said "it's just like Linux, right down to the kernel interface" or "Everything works just like Ubuntu, because the userland is Ubuntu". Succinct and correct. Precision matters.