Not true. There is indeed a gravitational monster, but it is a Black Eye. There is no invisible mass inside.

Physicists have the hardest time in the world to recognize that zero can have a function. So, their models don't incorporate a functional zero. They do not work with an empty center.

A Black Hole is, to use a word that sets us up to understand both distinctions, like a marriage. A certain assumption (consummation) is considered.

A Black Eye is, the opposite word, a divorce. Something is not assumed to occur.

In both cases, everything real is included. Make sure you capture this: everything real is included in both models.

But in one model more is assumed to occur than in the other model.

Yes, the gravitational monster is real. But, no, the invisible mass is just a fluke of a model that incorporates everything we know plus one thing that is not there.

Physicists shot themselves in the foot by rejecting the potential possibility of zero. Their rejection is why they worship the wrong model.

'A Self-Destructing Universe'

https://fred-rick.medium.com/a-self-destructing-universe-e5a6946e8721