The first question that would come to mind is how would the C-Elf know where to go, or how, to harvest the poisons? Beyond that, facts and circumstances.
As far as I know we haven't recently approached folks that were going for the occasional outside run. The concern was folks spending a majority of their time outside a city with a C-elf, or expressed a desire in doing things that could lead to this.
How, does anyone from Allanak, know how to do any of the things they do?
It shouldn't really matter if it's a protracted adventure, or a five minute jaunt. There is nothing, and I do mean NO-THING, in the docs, pertaining to city elves, about this supposed agoraphobia, nor is there any real indication that anyone, can find/identify any documentation, pertaining to it. There is phrasing in the docs, that even suggest they do tend towards some roaming, as has been pointed out.
There is ABSOLUTELY no documentation that mentions, references, or even suggests in definitive terms, that there is celven agoraphobia, and it is a strict requirement. Not only this, but I can say, from personal experience, as having played one who was almost exclusively an "adventurer" type, that I had never once had staff approach me about it. I had that character for, what, over a year, and interacted with people, from virtually every clan in the game.
How can, someone who is a walking, talking, monster slaying poster child, for this, apparently karma dumping offense, never get so much, as a "hey, whats up with you?", from staff, in such a long period of time?
Your argument, is all smoke. It's propped up, EXCLUSIVELY, because you are a member of the staff and people are wary of upsetting you, because you hold some sway over their karma, and their ability to enjoy the game. Had you been a regular player, and tried to press this argument, players would be piling on you from every side. And everyone knows it.
If you've got the docs, and can provide a reasonable argument, for how a new player is supposed to come, to your preferred conclusion, show me. I'll bow out, I'll concede I was wrong. I'll never post on the GDB again. I'll retire my pc, and never roll an elf again. You name it.
But, I don't think you can.
As I said in a request, as politely as I could manage, the IDEAL solution to this, would be an update to the documentation, to outline this, apparently new/unknown expectation, eliminating player confusion and misunderstanding. Just amend one paragraph, for all of us dummies, who can't interpret your vision. It's so easy.
Fixing docs and letting the pbase know, via announcement or log in news, is way easier, than mending fences, with people who presume themselves persecuted, or otherwise poorly treated, by high handed staff.
Being reasonable, isn't hard. Just try.