Somebody said this to me

[Phil]

If those two atoms were in an otherwise empty universe eventually gravitational attraction would bring them together.

How long it would take is another matter but it would happen.

Now think of that universe containing 190 billion supermassive black holes(give or take a couple of billion), it will happen. And before they have time to evaporate.

And even so what of the particles emitted? they will just be absorbed by other blackholes. Where else are they going to go?

This stops right here until you show with the proper maths that two Hydrogen atoms would do what you claim. Maybe it would have been easier if you had understood the example as is instead of trying to change it. Tell you what, you might want to read From Eternity To Here by Sean Carroll before you continue arguing nonsense.