I don't remember this quote exactly, or whom to attribute it to but it goes something along the lines of "throwing two unsolved problems at each other doesn't create a solution".
Because the "common black hole model" is static, while the standard cosmological model is not. How do you stitch them together without breaking either one, i.e. without violating general relativity?
« However, this common black hole model is in tension with the overall expansion of the universe »
...why would those have anything to do with each other, a priori?