It was because Hill foresaw the difficult days the Elves were about to face that he decided to set out early on his travels.
Everyone knows he acquired a lot of supplies, but Hill doesn't need to share the pressure humans impose on Eternity Island Elves.
This is different from those past events, it won't affect the safety of the entire Elf race, nor is it humans proactively targeting Elves; success or failure doesn't really impact their lives.
Humans aren't foolish, even if Coron doesn't care about suppressing the Elves who established a nation on the Ferun Great Land, he certainly wouldn't stand by and watch them die.
If they could use hard measures, who would bother with the soft ones?
As long as Hill is absent, no Elf could openly threaten Lynn in Coron's presence to compromise Hill's interests.
On the contrary, if Hill stayed here, Lynn would face immense pressure.