Per the article: http://www.swtor.com/info/news/article/20210426-1
Jaleit Nall
Jaleit Nall, one of the two new Galactic Seasons vendors, features classic and previously unobtainable promotional rewards with a few new things sprinkled in, such as the Carrick Station and Vaiken Spacedock Penthouse Strongholds! Everything available from this vendor can be purchased with the new Galactic Season Tokens earned through the two Seasonal Reward Tracks. Jaleit Nall’s inventory will rotate over time, ensuring that players always have something interesting to work toward.
While the new Fleet Apartment Strongholds will be available all the way through Season 2, all of the other rewards will be on a varied 3-5 week rotation. Using the Companion Dazh Ranos as an example, after being available for five weeks, she’ll then be unavailable for five weeks before appearing again. Not all rewards will be available on the vendor at the same time.
Every few weeks the vendor will be updated.
Patience, Padawan.