Spinosaurus couldn't swim in deep water?

Makes sense, the spinosaurus was only semi-aquatic like a hippo

@Xenotaris, hippos can and often do swim to the bottom of rivers, so your comparison is wrong. Just because a creature is semi-aquatic, doesn't mean it couldn't dive below the surface.  

Oh I assumed you meant deep water like the ocean

The rivers and lakes that were present in Spinosaurus' habitat would have been deep enough thaat it would have had trouble staying stable.

Even before this hypothesis, it wasn't thought that Spinosaurus would have even wanted to swim out into the ocean, since its food was found inland.

perhaps if the environment didn't suddenly change on spinosaurus causing its extinction then maybe the spinosaurids would have become more aquatic

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So it was more like a big, diapsid Grizzly Bear than a crocodile or duck.