Okay so looking on codeberg it seems the reviews are really limited to only some POIs if I understand correctly :

Bump mangrove-osm-coder to include reviews for more POI types. In v 0.6.0 we include reviews for OSM elements with tags:

amenity=*

leisure=*

natural=rock

shop=*

tourism=*

version 0.6.1 adds:

craft=*

healthcare=*

natural=beach

office=*

public_transport=station

So I was specifically looking at restaurants and didn’t see any reviews…