On the topic of whether or not it's an emulator, sounds like semantics in the end - fair enough, I disagree but you make a fair point.
That said, in terms of security I think it's very important to point it out that it isn't any more secure than running a random Linux executable. In my view, the original comment is advocating for running unknown executables under wine as a security measure, and the further argument is that it's more secure because most attacks don't target that.
Sounds like if people rely on that for security, malware will just start targeting that after people get used to assuming it's safe.