“I mean if you’ve accepted that the earth is at least 300,000 years old then it’s not 6,000 years old, right?”
The order of evolution is the point. If it can be shown that the whole purported evolutionary-tree lineage makes no sense, than neither does the theory.
Much of the theories on dating time, are based on evolutionary assumptions—layers of fossils and such, NOT on (supposedly) rock solid radio-carbon dating of the strata.
Young earth creationists insist that the earth was made—like a full size tree—with an appearance of age, and that the vast sedimentary rocks with fossils in them we see nearly everywhere were made in the great flood—also giving an appearance of age—which was really an unimaginable catastrophe.
One would expect to find homo sapiens bones then, as old as the oldest fossils, if you looked in the right places—and the supposed ancestor primates to homo sapiens—to actually be contemporary species. As to the real actual age of things, that’s a separate issue.
The order of evolution is not a fixed matter of dogmatic belief. It changes as new information is obtained and that’s nothing new. This is new information and the understanding of evolution will change with it.
Carbon dating had nothing to do with this as it’s not very useful in dating anything older than ~40,000 years. Trying to call carbon dating ‘rock solid’ in regards to ancient strata is either an act of ignorance or deception.
“Young earth creationists insist that the earth was made...with an appearance of age”
Why would God engage in such a deception? Why would anyone indirectly accuse God of being a deceiver who’d do such a thing?