However it was suggested by a mod in this thread that a move from one category to another normally takes 10-12 days at most from date of removal from the original category.
You misunderstood what Hutcheson said. When a site is newly listed in a category, whether as a result of a move or not, it
can take up to a couple of weeks before it is actually visible on the category page, due to server synchronisation issues. Usually it's visible within a day, but sometimes the servers are cranky. The "10-12 days" wasn't related to moves between categories (although I don't blame you for misunderstanding that).
So you are saying that if it was deleted, it is the result of an editor's mistake?
Actually, what shadow said was that an editor might have listed the site in error, and that that would have been discovered and rectified at a re-review. But of course it is always possible that a site is removed in error as well. The possibility of human error is inherent in any project where humans are involved, and shouldn't need to be spelt out. But from my experience, accidental removal is a very uncommon mistake to make.
There is another possible outcome. It could indeed be deleted.
It could be deleted if it was found that it wasn't listable. That was actually explicitly said in the very first response you got in this thread, from informator.
Or it could be moved out of the directory 'temporarily' while it sits in the in-tray of another busy editor who may have a year or more of submissions taking precedence.
A common misconception - sites are not sent to any one specific editor. They are sent to a category, where a number of editors have editing rights. Sites sent to a category by another editor often get a faster review than those coming straight from outside suggestions (that is not a hard-and-fast fact, it depends on a lot of variables and may vary a lot between different parts of the directory, I should add).
It might seem a terrible thing to say, and I am not meaning to offend any of the diligent volunteers here, but I can't help feeling that 'trying to do it the right way' by approaching this forum has been counter-productive.
That is something we can obviously not agree on
You saw a listing that wasn't right, you told us about it, and action was taken because of it. The editors work to make the directory as good as possible, without special consideration for any one individual site. We try to avoid having good sites hanging in limbo, but for the user it is better not to have an unrelated site in the category they are looking at. So, thank you for helping us out.