I'm normally able to follow narrative (both fiction and non-fiction) that has something to teach, and also enjoying listening to classic literature no problem...

But sometimes I'm reading a long article from the internet and I experience what you describe (losing track of what author is saying, having to rewind to get the point). After a while, I realize it's not the computer's fault, but the article is just very low content (e.g. some authors just pile on words, emotions, opinions without a coherent narrative or point). Recently I noticed I'm able to detect GPT-generated text this way too... words without content or message.

Perhaps the monotone TTS can be a test for the "meaning" contents of a text.

https://www.graphicaudio.net/