I see nothing in any of that material that is supportive of them dying from a global flood, let alone a global flood even occurring in the first place.
One strange phenomenon observed with Clovis culture disappearance is that almost no Clovis people fossils have been found. Thousands of beautiful and exquisite spear heads and tons of bones and food items, fireplaces - but no human fossils. Just one child fossil found.
Clovis culture was the pre-flood human culture in the Americas, then it disappeared.
Evolutionists tell good stories, so I want to try my hand at explaining why the Biblical flood left hardly a dent on the geologic column, and very few human fossils. Also the megafauna came to a sudden end, the giant sloths etc.
Suppose there was a flood as described in the Bible. This is a slow flood, a rise in water over 40 days. There was no CNN weather warning, no satellite tracking of storm fronts. One day, for the Clovis people, it just started raining really hard.
I suppose the good folk of Clovis did what the good folks of New Orleans or Houston did when Harvey struck. As the water rose, the folks climbed onto their roofs, up trees, or, if there was a nearby piece of high land, they ran there.
When the water kept on rising and the helicopters did not arrive, the Clovis folks held onto driftwood, till they all drowned. They left behind their exquisite spearheads.
Drowned human corpses from what I remember from crime shows, have a tendency to not sink to the bottom and stay there. They bloat and float. So, the crocodiles and sharks, and bacteria had a party.
The flood was not a fossilising event. Lines of fauna, and nearly all humans were wiped out without a trace. But the flood did not last long enough to stop vegetation regrowing. Trees were killed, but their seeds survived and germinated. Thus no tree today has more than about 5000 rings. Obviously all aquatic organisms did not mind the flood one bit. Sharks, whales, dolphins played around the ark.
The ocean conveyer belt system was disrupted, and the climate changed, so temperature graphs show disruption of the climate due to the flood. They call this disruption of oceans, the Younger Dryas.
The modern, smaller fauna quickly repopulated the earth, so that we have what we see today.