My take on it is that the announcement was made in the janitors' wiki which is supposed to be read frequently by janitors. The implication is that if you didn't see it there then you aren't an active janitor so it is reasonable that you should be droped from the list.
The "no second chance" decision is pretty much implied once the "only active janitors" filter technique for culling was selected and assuming that a large enough pool of janitors remained after the cull.
It should perhaps be noted that even those droped from the list retained access to the janitors' wiki for a period after the cull to allow the discussion leading up to the cull to be available.
DWIM is Perl's answer to Gödel