> Plato's account is of a civilization that was defeated in a war with Athens ten thousand years before his time.
To me, this barely seems relevant to any criticism of the story. Plato had, at most, 2000 years of written history to draw upon (and I’d guess far far less at his disposal), so his estimate of the age of an ancient civilization is inevitably going to be quite far off.
I don’t disagree with the conclusion, but that seems like a minor glitch.