To my mind there are too many coincidences here for there not to be something in it:
1. The rescue helicopter video where the rescuers were doing exactly what happened to Esther a few months later (premeditated?).
2. Esther writing "I think I can see you" (could she see him?).
3. The BBC article comes out the same day she disappears.
4. Dan waits 3 days to alert authorities.
5. Dan's BBC interview where he says he "loved" her.
6. Dan goes off searching on his own, leads them the wrong direction (deliberately?).
7. Dan hiring LBT to control the narrative, rubbishing claims they were "on a break".
8. The bone fragment appearing literally out of nowhere (deliberately placed?).
9. Dan magically finding the body when the search teams couldn't, even with all their special equipment and helicopters etc.
10. The missing items and tent.
11. Dan now fund raising.
Each one of these things could be explained away on their own, but put them together and it's too many coincidences & red flags imho.
@TiaanG has summed up all the reasons why the French Police are spending so much time and money examining the remains so thoroughly.
"I think I can see you" is probably the most blatant red flag.
Inferior poetic abilities have little to motivate the police interest. It's probably DC writing about hating and loathing Esther that bothers them.