I'm not that familiar with the GK 'dex. However, you'll never find anything telling you what you can't do (there are a very few exceptions). 40K is a permissive rule set, which means it only tells you what you can do.
That being said, from my understanding, if the stormraven hasn't moved, it shouldn't be a problem (disembark and then shunt). But, I can't really answer more than that.
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