Sometimes I see deck dimensions on a shop site and think "Surely that can't be right" but most of the time they turn out fairly much right if not spot on for everything else.
More than anything there are a few typos, eg on Tactics, I had seen a board that should have had 6.625 listed as 6.25 tail, so they just forgot a 6 in there.
There was another really good one the other day, something like a 1.45 wheelbase - meant 14.5 wheelbase of course, but maybe they ran out of coffee or had other things going on that day.
Boards don't really change that much nowdays, with fairly general dimensions, but I know I feel like it is not going to be a good day when I get a board that is even 1/8" too small from what it was supposed to be, no matter where, be it width, wheelbase, nose or tail. At least I always just take it off and pass it on to someone else who is happy to have any board, but for someone who is spending hard earned money and cannot afford a new board every other day, it would be a rather unfortunate situation.