C13 (the other stable isotope of carbon) comprises about 1% of organic carbon samples, and is the one compared with C14, which is much less than 1%.
Watching the video, he states he has over 5% C14 in a sample. That shows he’s not actually much of a scientist, and (like you) is just pounding the drum for his bias.
That out of the way (hopefully), what do real measurements of RC of dino bones show?