I have never done it, but am considering getting pages cleaned - and during the process will likely need some reinking done. Because the cleaning will remove certain lines completely. Thus far, i have not pulled the trigger, as I'm hesitant to make such drastic changes.
Ideally the new inker would "sign" his work, so future buyers are aware of the enhancement.
But realistically, I expect re-inking will occur/has occurred more often than we know.
Also - regarding the OP, I suspect the image was manipulated, and the page was not reinked