For a supermarket, the breadth of the offer makes this distinction especially important: a listing may record the offer as fully halal, partial, or unknown. A certification shown on the listing remains separate from that overall scope and should not be generalized to the whole store. When the information is available, alcohol is also handled explicitly, including the possibility that its status is still unknown.
On Haliago, these signals remain separate: a certification on record does not by itself mean the entire offer is halal, and missing information is never turned into a guarantee. Listings may also show reviews, opening hours, open or closed status and other practical details when available. Before visiting, open the listing you are interested in and check the information that is actually provided. These details can change as listings are updated: they describe the information currently recorded on Haliago, not a certification issued by Haliago.