I’m not kidding - you can’t trust C14 dating. I don’t care if it’s creation related or not. They will have looked at other factors - the kind of paper, the kind of ink, where it was found, done their C14 hocus pocus, then give you an answer based on those other assumptions. C14 could have given them a 500 year window.
If you can trick a C14 dater into dating a dinosaur bone, it will show up as ~10000 years old. But he won’t do it if you tell him what it is.
It’s parchment (vellum), not paper. If it were on paper, yes, paper of that era often had watermarks and they can to some degree help with dating the paper. But parchment is made from animal hides and, sorry to say, has no watermarks ever.
Ink won’t help. Even if they determined the kind of ink, it wouldn’t tell you much—there were only a handful of ways to make ink and all had been in use for centuries so establishing a particular kind of ink rarely tells anything about date. If it were some uniqe, modern kind of ink, yeah, that would tell you something—that its not old. But ten-to-one they’ve already done that testing. They can’t carbon-14 the ink but there are other ways (including eyeballing it) to figure out what it was made from.
If it were written in a regular language and script, it could be dated from the style of writing.
But it’s not.