Its a bit sus since there doesn't really seem to be much discourse on this either. Like okay, it solved the puzzle but the puzzle was just a key cipher with plain text? And how is this verified or even matter in terms of what it reveals? Seems more like a marketing fun post than anything susbtantial.

They published this on 31 aug and nobody in that community cared and no news covered how this 300+ years mystery was solved?

Conversely, the cipher could be so boring that no one in any academic circle bothered publishing on it.