Not sure what you are referring to. The refund policy on Steam is the same for any games, early access or not. The game's version number or finished state makes no difference.
Maybe you are thinking of the pre-purchase situation, where you can refund up to 14 days after the game's release, instead of the date of purchase.
A few too many superlatives in their pitches for my taste. Not a bad idea overall, though the bias in favor of Rust is strong. Did it really become the go-to (heh) memory safe programming language for performance ?