The title is link-baity and overreaching, but the article itself is actually good. It's a shame.
The real change here is moderator feedback (two-way) in the threads, which people seem to agree is helping. I fear how meta it is, but we're still in a transitional phase. We'll eventually try receding a bit, after it's had time to sink in.
Spaced and varied learning is more effective - which fits with Gladwell's/Dweck's "deliberate practice"/growth mindset anyway.