Then why did they not get on the Ark?
I think they did. Scripture talks about kinds, not species.
Many varieties of tyrannosaurs existed, so just a pair could represent all tyrannosaurs.
Another of their videos says a kind is not a species, it is a supergroup and within the representative kind of the animal exists all the variations of species.
So for example, they mention 'felids' as a kind under which exist many kinds of cats. So the felid that got on the ark, with the genetics of those 2 individuals existed all the various cat varieties, lions, tigers, domestic cats etc... Dog kind same way.
So no lions and tigers on the ark, just some kind of cat perhaps.
There were many different elephant like creatures in fossils too, but a 'elephant kind could have produced all the varieties of elephants.
The other thing, God draws the animals he wants on the ark, bringing them to Noah , maybe he just did not want some of them.
speculation since we did not see it.
20 Two of every kind of bird, of every kind of animal and of every kind of creature that moves along the ground will come to you to be kept alive.
5 And Noah did all that the Lord commanded him.
6 Noah was six hundred years old when the floodwaters came on the earth. 7 And Noah and his sons and his wife and his sons’ wives entered the ark to escape the waters of the flood. 8 Pairs of clean and unclean animals, of birds and of all creatures that move along the ground, 9 male and female, came to Noah and entered the ark, as God had commanded Noah. 10 And after the seven days the floodwaters came on the earth.