For the folks bringing up how Lantan was hinted (a really long time ago), I actually went back and listened to it...
I'm pretty certain that Perkins is referring to the Lantan ship in Dragon Heist. Both Perkins and Sernett clearly know very little about Lantan, meaning that they haven't actually developed much internally for it (compare it to the Chultan Dwarves, where they actively talk about how they remade them for 5E). They aren't even aware of what form of government Lantan has, which seems to some pretty top-level important stuff if you plan on visiting it in a future module.
That said, that doesn't mean this year's adventure isn't in Lantan. I just wouldn't use this video as credible evidence for that, as it seems they aren't planning for this module at that time.