>>33542424youre right, it is possible. In fact, if anything, that scene is probably the perfect place for Hau to have a makeover, so if it doesn't happen then, it likely won't happen.
Even if it doesn't happen, though, remember that every true leak always has some fake information mixed up in it, even the XY leak predicting fairies and everything had some false info there.
Hau can still pull a Blue even if he doesn't change clothes, but it doesn't look like Lusamine took a chill pill at all since Lillie still had to steal Nebby (check pokemon website gallery)...although even that bit can be part of the false info