It’s really good that you are using Google PageSpeed Insights improve your Website Speed. But you have to understand one thing, Google PageSpeed Insights was built before AMP.
Because AMP is a different technology which was built after Pagespeed tool, they are yet to calibrate it for AMP. But if you still want AMP in Google PageSpeed Insights, then you have to use the URL of AMP.
Hope it helps. We will keep updating this article.