The 30% figure seems to be completely made up and this whole article is adfarm-bait.

The CABA trial is an 8-week single-arm pilot (no placebo). The study measured cognitive improvement over 8 weeks in a single group — not "slowing of decline versus placebo." There is no 30% figure anywhere in the paper.

I'm glad we have AI to quickly read this kind of stuff and check these kinds of claims for us.