I'm not sure I agree with this chart, but I guess everyone is different. To me, a red delicious is not tart at all. It's...tasteless. I also find 'good' cripps/pink ladies far more tart than any apple listed.
I buy honeycrisp only for its texture, so I can't comment on the sweetness ratings as it's not my thing.
I buy honeycrisp only for its texture, so I can't comment on the sweetness ratings as it's not my thing.