Hello,
No, that comment has got nothing to do with the add/change dumps. That comment is only relevant for the full database dumps.
It seems to me that the script for generating the actual add/change dumps did not run at all on September 30, so nope, this was not a known issue.
If this persists, please do create a task in Phabricator under #Dumps-Generation.
ArielGlenn added a comment.
This month we won't have a second run because the servers that produce
the dumps are being upgraded to Ubuntu trusty and to use HHVM instead of
php. We'll be back on schedule for October 1 though.