I'm afraid you can't conclude ~300 - that's a guess. We have 71 listed on roll call, a bunch more people trickling in. I didn't see more than, say, 30, requesting adding to roll call. Then we have a bunch of people, some of whom lurkers, pop in to say yes or no. There's no way to know how many admits have gone through, how many not.
I am not losing hope because I interviewed on November 15th (I'm non-international), seems they are going by interview date at least somewhat.