If you check Wikipedia Page about such Spirits, among Myths about them, there is this:
"The Klabautermann is associated with the wood of the ship on which it lives. He enters the ship via the wood used to build it. A belief existed that if a
stillborn or
unbaptized child was buried in the heath under a tree, and the wood was then used to build a ship, the child's soul in the form of the Klabautermann would transfer onto that ship."
Punk Hazard References can't be Coincidence, Franky being the one to see that Mural & drawn under Tree is not Coincidence (Klabautermann may appear in the guise of the Ship's Carpenter - Another Line from Wiki), that Ancient Laboratory, Kids who knew about Future Events, the entire Nika Persona & Sounds He make, being associated with both Helping & Destroying (Same as Klabautermann), Adam Tree Wood being used to make Thousand Sunny, Elbaph's Association with Legendary Shipwrights ... etc
People forget that Elbaph changed since Harald Ruled, but Louis Arnote Warning was for Pre-Harald Elbaph (Probably),
It's Land of War, and it makes sense that overstaying there as an Outsider can eventually ignite Battle or War, and no matter how you fight there, you will eventually damage Adam Tree cuz it covers the whole Island, and We're seeing it now,
I also think it's extremely convenient that Elbaph's Treasured DF brings Lightning which is literally what you don't want to see on such Tree Island, almost like the one who eats it is supposed to actually Target Adam Tree, just to Trigger something, (After all, Loki was Introduced as such Threat)
Oda does this Tactics sometimes, like Implying Big Mom is a Cannibal in her Teaser Introduction, and then it was revealed They were just Homies, just to make you feel safe & disregard that initial implication, and then He hits you with Big Mom's Actual Cannibalism,
Same thing here, Oda starts by portraying Loki as the guy who should Destroy Elbaph/Adam Tree, and then He becomes an Ally & cool guy & He protects everyone, only for Oda to reveal that Adam Tree is supposed to be Damaged or Destroyed indeed, that's the whole point of having Lightning, Flight, Shipwrights & an Army, it's about freeing those children's Spirits from Tree & transferring them to Ships, led by Giant Army,
It also fits the Theme of this Arc, as having Children or losing them is what's being used against these Giants, only for it to become their Source of Strength.