We never said they would be retired
I was really hoping we wouldn't have to retire the items (just because it's a pain to reopen a shop that way because not everything comes back the way they were rarity wise lalala). Retiring them all now!
Assuming nothing happens to them from now and next Masq, the area next to where we change the rarity records what the previous one was (so we don't have to put them in notes). But our policy has always been when unretiring items, we make them a little higher in rarity while making the new items lower in rarity to get a good portion of them out.