I, too, am one of those that submitted an "not of August" photo. I did not see anything that actually stated the photos had to be from the month of August. My interpretation was merely that the topic for August was night photography.
I think that if it were meant to be taken in that month of the contest, it would have been explicitly stated that way. It wasn't, and other posts in the threads about the who, what, why of the contests seem to indicate that there's no rule stating the photo must be taken in the month of the contest, only that it needs to meet the theme.
There is at least one photo where I can't see any indication that the photo was actually taken at night. So, I have to take the photographer's word by the fact he submitted it against this contest topic that it actually was a night shot. In a similar manner, I accept the photos submitted in good faith and submit mine similarly, expecting that if there is some intent that the photo be taken in that month, it will explicitly be stated, otherwise any reasonably recent photo meeting the criteria is acceptable.
And yeah, I know: the definition of 'reasonably recent' is subjective. I could also argue that any photo could be submitted as a night shot since it's night somewhere on this planet at the time I took the photo.