These look to be new. Refurbished listings clearly indicate that, for example, the listing "Refurbished iPhone 7 128GB - Black (Unlocked)" [1], and it goes on to describe details about what a refurbished phone from Apple entails — all things that are missing from the iPhone SE page. My guess is Apple doesn't normally sell new "clearance" products, so they decided to just add it to the existing discount/refurbished store.
[1]: https://www.apple.com/shop/product/FN8L2/Refurbished-iPhone-...