...got no clue as to what exactly it means...
...they've created derivatives...
The article doesn't mention derivatives.
How perceptive of you. Tell me that there are no bets on the survival of junk bonds. ETFs? They're not derivatives. Do you know what they're holding? Ever hear of total return swaps? Somebody have to draw you a picture? They make things more volatile and are bound to leave bagholders when it all goes sideways.