I don't think that's really the fallacy of grey, if I have to map it to a piece of LessWrong-speak, I'd call it privileging the hypothesis; it's not saying you can't be sure of anything, if you're a good Bayesian it's not really telling you anything new there, it's just bringing one particular super-implausible hypothesis to your attention so it occupies much more of your mind than it has any right to.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Duration set to six days to encourage Monday as first day.