Deadline extension for submission or completion

So this message came up on my review page: If you started your application prior to 11:59pm PST, November 30, you will have until 11:59pm PST on December 1 to complete the submission of your application for fall 2016 admissions.
Is this for people who got stuck with the ‘submission’ part due to the site being too slow, or can people use the extra day to review their applications?
**I finished my application a few weeks ago, but a lot of students at my school have been asking the same question on social media.

I think everyone sees that. It’s just part of the process.

It makes no sense though because EVERYBODY would start their application prior to the deadline, or else they would miss it.

I would urge everybody to get their applications in prior to that deadline regardless and not play with fire.

Got through the admissions office on call. You can all edit and review your applications until 11:59pm December 1. You’re not playing with fire!! Relax, and review