It's highly unlikely that they have any other ships equipped to launch the three missiles they've managed to make
You also have to remember, the intended audience for these hypersonic missile announcements is domestic, not international. Last time Putin and Shoigu had one of their televised state of the military propaganda adresses to the people, these missiles were a big part of the conversation. It is suspected by many that this is just the Russian version of Hitler's Wunderwaffe