I came across this article a few years back that explains the issue with it. https://aeon.co/essays/schools-love-the-idea-of-a-growth-mindset-but-does-it-work
Along with that there have been some reports that it appears to be successful, though more studies need to show.
This experiment illustrates a great way of using tech as utilitarian value. I wonder if you’ve read Cal Newport’s books “Deep Work” and “Digital Minimalism” which the author emphasizes of using technologies for beneficial use and eliminating ones that are distracting or useless.