This is consistent with the Biblical account of a global Flood that destroyed most of the air-breathing life on the planet in a single brief cataclysm only a few thousand years ago."
Maybe, but it wouldn't have to be from the time of the Flood.
The Bible also alludes to man existing prior to Adam. He was annhilated catastrophically and left no living progeny, but before we can know any more about him, the curtain closes.
Some recent DNA analyses of ancient remains showing no relationship to modern man seem to support the Biblical assertion.
Sounds like you disbelieve Jesus, who called Adam the first man.
He was annhilated catastrophically and left no living progeny,
That would mean death came before the Curse, which also contradicts the words of Jesus.