We ignore this science and try to teach Calculus to 10th graders (and when we can't quite do it, we invent "pre-calculus" which is just algebra stripped of anything that isn't directly applied in calculus). Children's brains develop at well-known rates.
It's been a huge mistake over the last few decades to try to teach calculus and algebra in earlier and earlier grades. My opinion about pre-algebra is that it should disappear from the face of the planet. If you're asking whether Khan Pre-algebra counts as "knowing algebra", then the answer is "no."
If you're asking whether Khan Pre-algebra is good enough preparation for Khan Algebra, the the answer is "yes."
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