Question

Hello Honorable Rabbi, I have a somewhat unusual question
I saw a lecture by a rabbi who is considered very great in the Torah world, and there he claims that the age of the world is no more than 6 thousand years, as is accepted in our tradition, and what scientists say—millions of years— is only because of the Flood, where supposedly all the bones of the creatures were cooked by the heat, and when they test the age of the bones they arrive at millions of years “by mistake.”.
First of all, I have to admit that I have no idea how they do this dating of the bones or whether it is at all reliable, but let’s assume there is a way to do it, if we take, for example, 2 chickens that died at the same age, and take their bones, one of them we cook over a fire for a long time, would the dating of its bones be different from the chicken whose bones we did not cook? Can there be confusion in the dating because of the “change” that occurred?
Thank you in advance for addressing this!