Millions of black holes

At https://phys.org/print421408278.html … there are a lot more black holes in the Milky Way than previously thought according to a University of California Irvine study. There are in the order of tens of millions in our galaxy alone – and we once thought there was just one big black hole in the galaxy centre – somewhat like the black liquorice surrounded by pink or yellow coconut in a Bassets Liquorice Allsorts. There might even be as many as 100 million of the black holes – so how does this abundance square with mainstream black hole theory? If black holes are derived from cosmic lightning then they may even be underestimating the number – which may further undermine consensus theories.