Because by definition offensive has to do with how people receive something. I love the library, will continue using and donate, I would prefer the docs not to assume that people that print papers are animals. That's all! Take it or leave it.
i read that as sarcasm delivering a subtle critique on digital consumption in 2021 and how print has been killed by digital media (for most folks). obviously they acknowledge that people still want to read in print, otherwise, why would they bother to add this feature?
maybe i'm reading into it too much, but i don't think they think print readers are inferior.