It's a complex subject, but having read the article, I think I would stick with steel or titanium for my next purchase which would be a mountain bike for trail riding.
I have an aluminum frame Montegue, the military folding design they use for parachute troops. Suposedly the strongest frame made. It is electric by HPC (High Powered Cycle).
It’s quite heavy for a mountain bike. But then it makes my aluminum frame Schwinn mountain bike seem very light.