The comments are saying they won't be in Orlando because of the hotel timeline. Lame.
There's a limited, every-other-day window where those guests are even in the land. You could schedule around that as easily as making sure Mickey isn't out anywhere in MK within 15 minutes of the parade,
e.g. If this was truly an issue to Halcyon guests, which I doubt it is. So dumb.
ETA: So WDWPro has a different spin on this. His theory is that Grogu will be
limited to the starcruiser, in a revamped, new era story. In other words, he's still coming, but WDW guests who want to see him will have to pay up.