That's a totally unhelpful comment. You imply that you know something that should be obvious and you think it's more helpful to be condescending than to contribute what you think.
The issue is that Apple's security engineers must have realized that there was a good chance someone would reverse engineer the patch, and from there find out the OS X is also vulnerable.
The difference between your comment and the conversation you have interjected it into is that you are being unhelpful and insulting on purpose, whereas there is room to resolve misunderstanding in the former case as you can see from the followup.
Thanks for showing us what kind of person you are.