It seems that while carbon dating does tell us that Hell Creek Formation is around 65,000,000 years old
No, carbon-14 dating is completely silent on any dates at all past 50,000 years or so. It's essentially all decayed by then, and can't be used. Much like trying to lay out a racetrack for a marathon with a one-inch dial micrometer, it's just the wrong tool.
I'll be away from home most all weekend, so I can't promise any immediate links, but I remember that volcanic ashfall layers within the Hell Creek fm. were used in dating, most likely by potassium-argon or argon-argon. That, and the "iridium layer" that caps the Cretaceous (which contains the Hell Creek) has been dated by at least four independent methods at a couple dozen places around the world. And they all agree at 64.7 million years, plus or minus a few.
Don Batten, Ken Ham, Jonathan Sarfati, and Carl Wieland....
....completely ignore the extensive literature that actually reconstructs the history of C14 content of the atmosphere for the last 38,000 years. It's been correlated with tree rings, lake varves, ocean-bottom varves, uranium-thorium dates of corals, ice layers from twenty or so spots around the world, stalagmites.....
They're bluffing, and hoping their intended audience doesn't know (or care) where to go to check up on them.