When I think of my own company, such a person would ideally be tasked with reading the user guides of the tools we use and quickly answering questions of the form "can we do this with it?", amongst other things.
This article is good but like others it focuses on the problem of getting people to write. I've found it's much harder to get people to read. The dirty secret of most workplaces is the massive disparities in reading speed that exist and the subtle tensions that can cause. It's something myself and my manager have both wrestled with, as we both read much faster than some of the other less technical people in the firm, and thus don't think much of dropping a six page memo on people or having long/complex discussions on Slack. Then they get frustrated at the implied expectation (sometimes that they put on themselves) to read it all.