This model has been in testing for 3 years and it passed all tests so far.
It already past sevral test and it solves a lot of problems that require dark energy or matter. And problems introduced by the James Webb telescope. It also confirmed cosmic chronometer findings on the expansion history.
It does not disprove models, it just shows that dark matter and energy are not needed and explains why we can’t find them.
Your not wrong exactly. The theories hold up perfectly, they work consistently at many different scales. But at the largest scales, when looking at galaxies, or the universe as a whole, the theories don’t hold up. Or, they would hold up, if the galaxies had more mass in them than we can see… So the simplest explanation is that we’re not actually seeing all the mass that’s there.
That has turned out to be right so far. By that I mean, we have found a whole bunch more matter that was previously unaccounted for. We just haven’t found enough of it yet to fill in all the gaps.
But yeah, we stick with the dark matter idea because it has sort of panned out so far - we have found more stuff.