They were not uploaded in a batch - the first of the 14 videos was uploaded on Aug 5, 2011 [1]

So either a) he planned to make only 14 videos in advance - culminating in the flight video OR b) he went back and edited all of the titles.

So I checked the cached version of the previous videos - and it does appear that it is (b) - he edited all the titles adding the 14 after the fact.

[1] [http://www.youtube.com/watch?v=cocLpRzZnvk&feature=chann...]