quote:
It does fit the bill for the first part of the definition in that it is talking about something beyond the "visible observable universe". To go beyond that we are definitely into the speculative
The article you are quoting says merely that it is a part of the visible universe that is not visible to us (and it is detectable in principle, so it is not absolutely invisible). Dark matter is HERE, not in some unspecified "elsewhere" beyond the visible universe. So your argument requires a strained reading of even your hand-picked (and not very good) definition. A reading that would be widely rejected because it is clearly absurd.
All I can say is that if supernaturalists are reduced to such dictionary games, trying to claim that natural entities are supernatural to bolster their beliefs then supernaturalism is clearly irrational.