The app uses the same data for wait times that are on the signs. The problem is that the wait times can suddenly change, to your benefit and to your detriment.
I think the reason MCO security always takes so long is you get large groups with kids who don't travel a lot. They take FOREVER going through security because they're not used to all the rules. I think it's a lot of people's 1st/2nd/3rd time on an airplane. Part of the reason why I finally ended up getting Precheck.
That being said, aside from super busy holiday times, I've never seen it above 25 minutes.