I hope all that crap on the top is construction scaffolding!
Stealth is somewhat different in the oceans. The curvature of the Earth and the water will remove most of the radar signature from the vessel.
I think most of it is. There is one narrow antenna tower behind, but it can't account for all the mess that we see in the photo. Here is a photo from Wikipedia. Here is a photo of a sister ship, showing no scaffolding, just lots of antennas.