I would assume the manager's a terrible reader and writer.
Most people are. Most managers are.
It's one of those upsetting things I've learned about the world as an adult, that's sharply contrary to what I believed as a child. I kept being surprised by all kinds of things until I began really to appreciate that, simply, most folks aren't especially literate. Even ones who attend and attain degrees from universities—surely at least nearly-all of those people can read and understand "college level" texts with some fluency? But no, that's, somehow, not even close to true.
Most people are. Most managers are.
It's one of those upsetting things I've learned about the world as an adult, that's sharply contrary to what I believed as a child. I kept being surprised by all kinds of things until I began really to appreciate that, simply, most folks aren't especially literate. Even ones who attend and attain degrees from universities—surely at least nearly-all of those people can read and understand "college level" texts with some fluency? But no, that's, somehow, not even close to true.