Isn't that what they are standing on ? Those people at the rear section aren't standing on a wing.
Looking at posts 6 again, and at 21, and I don’t see any anyone standing on anything. And I certainly don’t see any bright yellow slides in either picture. Clicking on the link, I do see folks standing on the wing, and some folks wading through the water toward shore. One picture seems to show a couple of empty boats of differing sizes pulled up to the front doors.
If the rear slides had deployed, the folks wouldn’t have to wade - the one on the right side would have about reached to shore.