I don't quite understand what they're talking about, but from what I know about real-time, I would understand it to mean that for a userspace programme, there's no way of telling whether or not the kernel's been patched with the real-time patch. The only effect is that processes will have lower latency ("better real time behaviour").
Perhaps someone who understands it better will be able to give you a more definite answer.
Hope this helps,
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