I think the same applies to entertainment broadly: movies, podcasts, tv shows.
Instead I think that the real attention span is not consumer-based, but rather based on interaction with the subject matter. Simply put, I think the level of engagement with a material has to be on a certain level before you can claim it takes attention to consume it.
Yes, a Stranger Things season lasts 8 hours front-to-back, but if you zone out for an hour in between they're still looking for the alien mystery and they're not suddenly going to die because you didn't think along with all the plotpoints.
Contrast that with a university lecture, where if you zone out for 15 minutes you might never catch back up because you need to interact with the material in your head to be able to consume it properly.
I think that nuance is missing if you just say the words "attention span". "Attention" may just be the wrong word, and so I think nothing is really solidly refuted here, and I do indeed think that the attention span is dead.