I've been firmly diagnosed with ADHD, once when I wasn't even being tested for it, but ADHD markers were high enough that they asked if I was seeking treatment for it. That being said, I can read books just fine. I've read tons, and not just fiction. I have several nonfiction books about scientific topics I'm into. I'm currently reading a book about British royalty just because I like David Mitchell's comedy.
I cannot imagine that I'm special. I'm certain that there are other ADHD power readers. It's a way to hyper focus after all. I know sitting to read is a common problem area, but not always.
I read a ton, but this still happens to me. I'll read an interesting line, and then start thinking about the implications, and what I would do if I were the author, and then all the things that you could do with this information, and then I'm at the bottom of the page and realise I didn't pay attention to what I was reading because I got distracted by my own thoughts lol