you are self-sufficient if you harvest enough calories to get you through the winter. that's the definition.
you aren't "self-sufficient" if you grow a bunch of tomatoes or whatever. there's nothing wrong with that. i grow my own vegetables too, it's just a nice thing to do and learn from.
calling it self-sufficiency is just LARPing.
the only ones who can be remotely called self-sufficient are farmers who do the classic pre-industrialized way of farming. those are the few who can actually feed themselves if push comes to shove.
@McMongoose what prompted me was that i just saw a post of someone on here with some pictures of tomatoes and strawberries tagged as "self-sufficient" and this trend annoys me greatly. the same goes for all the fake-permaculture bullshit. there are people calling using plastic fleece against weeds in their vegetable beds "permaculture".