It’s most definitely a retcon because Connix literally says in TLJ: “Our distress signal has been received at multiple points. But no response.”
Anyways, my point in bringing this up is that since the title of this movie is The Rise of Skywalker I’d say it’s a good idea to hone in on the thematic side of things. Kijimi is one place where that is possible (as well as the puppet show).