Yes apologies, I was a bit lazy and responded to an unrelated question rather than raising a note generally on the item.

Food=yes is absolutely a tag:
https://wiki.openstreetmap.org/wiki/Key:food
https://taginfo.openstreetmap.org/tags/food=yes

And SC uses it to decide whether to show it's dietary quests on pubs, hence wanting to add it.

I've added the tag in https://www.openstreetmap.org/changeset/182853108 anyway.