Haveno-Reto has become RetoSwap with a new X handle and a new SimpleX room. It would be best to remove the old SimpleX room and join the new one. At the moment the website is still haveno-reto.com but I expect that to be changed soon.
Edit: new site is live at RetoSwap.com
Official repository https://github.com/retoaccess1/haveno-reto description also mentions that new site address.