I mean... different dishes have different names. Mashed avocados would probably just be called mashed avocados. Guacamole has many many regional versions, but I do think salt would be considered an essential ingredient in most of them. Salt would be a Group 2 ingredient. Nova calls out adding salt or sugar to Group 1 makes it Group 3, and specifically calls out Group 1 does not contain added salt.

"Minimally processed foods, that together with unprocessed foods make up NOVA group 1, are unprocessed foods altered by industrial processes such as removal of inedible or unwanted parts, drying, crushing, grinding, fractioning, roasting, boiling, pasteurization, refrigeration, freezing, placing in containers, vacuum packaging or non-alcoholic fermentation. None of these processes add salt, sugar, oils or fats, or other food substances to the original food." https://pmc.ncbi.nlm.nih.gov/articles/PMC10260459/