AIUI, all such results are because the FDA has given up since aduhelm and said "well, if it clears amyloid, that's as good as slowing Alzheimer's, right?" despite the actual results on Alzheimer's progression being largely negative.
Similarly, there were other drugs that lowered cholesterol that didn’t show a significant reduction in coronary events. As we later learned, it’s not nearly as simple as “cholesterol bad.”