you may want to read the contest judging portion of the rules. If the entries don't break any other rules they'll be picking from the top 25 voted entries.
this is what they said
'These ratings may be used to help select the top 25 Submission Images, but the Contest Entities will scrutinize every submission. Submission Images will then be judged by a panel of judges selected by Contest Entities who are employees of either Sponsor or its public relations firm (the “Judging Panel”) to evaluate and select the potential Winners. All decisions of the Judging Panel are final in all aspects of the Contest. Submission Images will be scored based on the following criteria:'
these rating may be used to help them but they will look at every single one to be sure.
so no they wont be going by the rating system alone, but obviously they will take peoples opinion into account.