When we moved in 6 years ago, we were under the impression that houses couldn’t be purchased to be ‘flipped’ (renovated and sold again)—has this changed?

There has never been anything in our governing documents that restricts this. It helps our community by having updated properties, Annual assessments are payable even if the property is vacant and the New Buyers Fee ($2,000) applies as well (unless the buyer purchases a unit within 9 months of selling another unit in Summerfield).