Dark Matter is just the name we give to the fact that the most widespread and accepted cosmological constructs don’t conform to the empirical evidence.
Bingo.
If you tried to pull the equivalent of “dark matter” in a school science class, the teacher would call it a “fudge factor” and make you run the experiment again.
How would they recognize it if it did?..............................
So it's a 'plug-in' for the equations cosmologists use in order to make the math work. As I suspected when they first told us that it is invisible but they couldn't prove its existence...yet it exists.