I haven't checked this as the full data the article was based on wasn't given in the article, but it wouldn't make much sense to count out-patients as part of the covid hospitalisation statistics, so I imagine that the word "hospitalisation" means in-patients specifically i.e. people who are sick enough to stay in a bed in a ward for a night or more, so things like pink-eye, fractures, even child birth (without complications) wouldn't count.