Hmm, PugiXML is just an XML parsing library. The purpose of the list is to link to solutions specifically made for reading Tiled maps (and they're not actually recommendations since I haven't tried most of them, it's just a reference). I think there are better resources available for choosing a suitable C++ XML library, like this question on SO (though being from 2012 it may be out of date). Also, somebody may have a favorite XML parsing library in each language and it would quickly add up.
Just a tip. Yes, Pugi is only an XML parsing library, but that is pretty much all you need (my opinon - others may vary). I guess one could go with tinyXML2 too. The ones refed just struck me as having both zlib + bsd license and extra dependencies (ex zlib and tinyXML) that seems a bit unnecessary to do such a simple task.
I entirely agree that an XML parsing library is usually all you need, and of course it has the added benefit that you don't depend on a 3rd party software package to get updated when something new is added to the TMX map format. Maybe it's worth adding a note about this to the documentation.