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.
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I think they’re two relative ages.
So the point in time we thought was 300 million years ago was actually 4.6 billion, which makes the universe’s total age not 13.8 billion like thought but rather 26.7 billion (due to other increased windows probably).