That's also what a developer who ships nothing, ever, looks like. There are quite a few of those. A developer who gets the most done and tackles the hardest work, on the most important and frequently used tools, integrating with the most problematic 3rd party systems and has specialist knowledge is likely to be called on a lot.
Ultimately you can't make any judgement of the developer without detailed understanding of the specifics of the work. This applies to every possible developer productivity metric which is why its so damned hard.