[[Your first link describes a flooded world with 200 mph circular currents in 500-meter-deep water over the continents. Are you suggesting any animals not on the ark could survive that?]]
Nope- never mentioned animals surviving it
[[I thought that was the point!]]
Which all the things that crept/walked and flew were wiped out. Some have suggested that the original reading of “Every Substance” referes to ‘col hayqoun’ which includes celestial rulers whos domain was hte earth after they were expelled from heaven. Also note that God said “For all flesh had corrupted their way.” - no mention of fauna being corrupted. Fauna are incredibly resilient and most certainly could have survived and passed along their seed and pollen