"Everything you actually could do is worthless to us, but please send all possible help for this scary thing that you don't understand and can't possibly actually assist with" is the opposite of "Don't Panic". It conveys helplessness and disempowers your readers.
That's the opposite of how I read that. I take it as a comfort that they're doing their best, and they're the best at what they're doing. If they needed food or money, I would gladly send it, but he's saying they don't. Great!
