From what I understand, this city passed a new law in November, organizing the city with neighborhoods (OSM suburbs) and made official the name of all streets in the urban area. A bit like a Master Plan, on a simpler level.
If you check the law, the last page has even a map for the city. On the same page, it is displayed the name of the collaborators on this law, and the last one has the same name as the user editing OSM, so I suppose they are the same person.
Nothing of this was discussed, but since it’s a city law and the document is official and public, I don’t see as a problem. I confess I didn’t check with detail all changesets from that user, but from what I saw I could see some changes in road classification and adding some stuff, so no harm as well.
Do you have something specific to be checked, @Fizzie41?
Also, the law did not mentioned explicitly OpenStreetMap, however it mentioned several data users
Art. 6º A Prefeitura Municipal de São Bento do Una comunicará e solicitará a atualização das denominações destas vias aos seguintes órgãos públicos e empresas: Departamento de Tributação, Departamento de Obras e Serviços Públicos, Google, Cartórios, COMPESA, CORREIOS e Neoenergia imediatamente após a publicação desta Lei.
At this time of the year (less eyes) and not-so-obvious changes compared to what typically would appear to be something that (at least me) do not have automated ways to checks (e.g. several street names changes at once, often this happens but is just a few), might make this not be looked after.