We have sites submitted with descriptions like "includes comprehensive diddliography" but when you review the site, the diddliography turns out to be "coming ... 'soon' ...". OK, that's the way to get a reputation as a liar. If it isn't on the site [yet], don't claim it is!
But as to the question, add your content FIRST. Then resubmit ONCE.
There are beings -- lowlife spammers, we call them -- who resubmit every month without turning a tentacle to actually add the claimed content. After several iterations, we may not bother to review anymore. And if the site was rejected last week for "insufficient content", we may simply reject another submission as a "duplicate submission" But one "insufficient content yet" review several months ago normally won't prevent or prejudice a future review.
