Its not really surprising they're using the 90s anime to promote Sailor Moon right now. The new movies are still far away and clearly still in production so its a little too early to start the promotion. They could use old seasons of Crystal to promote stuff... but im afraid they dont have that much faith in them.. they never did sadly. I feel (or rather hope) they want to make a new fresh start for Crystal with the latest chapter. Maybe the eventual success of the movies will made Toei appreciate the entire series a bit more. And hopefully they have better quality and promotion prepared this time around