It's true that people shouldn't do that as often as they should, mostly because they put things in his mouth he never said.
But this is different: XV was made by what is now Luminous Studio (currently developing Athia). XVI entered pre-production the same year XV launched, sure, but the latter's release has little bearing on this, as XVI is by a completely different team (and even company! Luminous Studio is independent now, even if still within S-E).
Like, for all we know, especially since this is S-E, XVI could have had the chance of having started development only 1 or 2 years ago and targetting, say, 2023/2024, because it isn't made by the XV team. That's not the case, since XVI is indeed the team the XIV team has been working on since 2016 and one that is most likely targetting 2021/2022 if it's indeed coming sooner than expected (again, expectations due to how awful S-E's planning has been for the longest). All of this isn't based on speculation, especially the development time.