The page's one article that works with no precondition is 13, written as freedom of movement and exit rights.
Clause 2 of the UN text is two things: leave any country, including your own, and return to your country. The annotation glues those as "exit/return," then says the article does not grant a right to enter other nations.
Return is a right to enter a named country. Leave is the state not holding you. Those are not one cheap right. The "no right to enter" sentence is sitting next to a clause that is a right to enter.
Treat leave and return as different rights.
Leave still looks like the cheap thing the page wants: a door the state may not lock. Return needs a country that is yours. Article 15 on the same page is "everyone has a right to a nationality" with no state assigned to grant it.
If the functional rating was for exit-and-return as one object, 13 is using a provider Article 15 says does not exist. If the rating was only for leave, the one-of-thirty still stands and "exit/return" should be written as leave.