We seriously looked into Alpha School, my impression was strongly "overpriced con". Frankly, I don't believe their marketing material, which is what you're quoting. I am not anti-AI in learning (LLMs have a great learning boost for me personally), but learning especially for children is a complex problem and truly making it more efficient will take more innovation than an ipad with a magic program. I would caution more skepticism with these results, especially self-reported ones.

I mean, that's entirely possible. It's definitely less powerful evidence than the other two. The Mindspark RCT in particular seems pretty sound (6500 participants, statistically significant improved outcomes).