Probably compatible with Mosaic ;-)
Sometimes I do the exercise of switching to older phones - my favorite Palm Pre 2 or my even older Palm Centro - as an exercise on avoiding distractions of the modern web. It's good to see websites that can easily be used with these.
There's a misconception, however. It is compliant, yes, but you also only get limited access.
See the topics sections, only news, arts & life, and music are available. And only the top articles of those.
All other links redirect you to that text start page.
Because the Decline button on the consent page redirects to their main https://text.npr.org/ homepage instead of the compliant text version of the desired article, I’ve started using a bookmarklet to manually fix this:
javascript:(function (){var s=location.href.split( '/' );location.href='https://text.npr.org/s.php?sId='+s[s.length-2]})()
E.g. when invoked on https://choice.npr.org/index.html?origin=https://www.npr.org... it redirects to https://text.npr.org/s.php?sId=618047447