Yep, going from a simple system to a complex system is more often than not, a thing that would have to evolved in one jump. The eye, and the brain-eye-analyzing complex have to upgrade at the same time. And that requires not a simple mutation, it requires a bunch of mutations and then it being passed on to offspring. So, this one in a multi-billion chance may have to happen several times.
The time this takes is longer than the universe has been around. And so, as you have stated, debunked.
What i hate on the math front is that they teach you calculus to shut your brain down from finding obvious problems with mathematics. They say asymptotic before (never gets there) to integrates after (gets there always)
When I first read about it, I thought, wtf??? I mean, about the mathematical impossibility of evolution. Then I read it from evolution believers, too. (and their sci-fi explanations why the math doesn't count in this case)
Just getting know the few necessary data, like how many mutation, how often happen on a given area, and how many is progressive, the really surprising was the size of the impossibility for the evolution. It's in practice, basically zero.
The funny thing, even the evolution believer 'scientists' admit this, but they still teach both in the schools... and both like facts. When one is the refuting of the other. 🤣
Too bad, I didn't know stuff like this back in school, I could make all my teachers look very stupid.
Indeed, it is still all taught. Even though its disproven.
But, that is why Rock-e-person made the schools the way they are, so that they will teach the lies, and continue teaching the lies.