I don't think Blueberry Academy is necessarily in another region, even if we are an exchange student.The wording of them being new regions stood out to me too - for SWSH they made it very evident that they were just extensions of Galar whereas for Paldea they seem to be brand new Regions - are the DLCs going to be essentially mini-regions with more content or just islands? (I did think it odd how we didn't see like any in-game content at all, even with EP for Sword/Shield we had in-game screenshots and a lot of reference sheets)
Especially since that's in Indigo Disk which has to connect to Area Zero