I mean, the Eonir aren't the Asrai when it comes to trees, they were chiefly concerned about their Waystone-trees, not ones you'd cut for timber.
If Gausser was a chaos cultist or something, then it absolutely would be their job.
Up to that point, no.
Like, when Theoderic Gausser* was preparing to make war on Hochland for his territorial claims in 2516, Karl Franz didn't put a hit out on him like it's the mob.
He had Balthazar Gelt turn his treasury into lead. Much more measured response.
*Some of you might be sensing a pattern here, but I swear that's just the only inter-province conflict that I know was solved with wizards, they aren't all because of Nordland