They offered almost 4000 reputation in bounties so far this year:
Note that the -4827 is the decrease in rank, not in reputation, that's 'only' -129.
If you check the checkbox "show removed posts" on your reputation tab, you should see also the reputation lost when post with your suggested edit was removed.
You can check the section "My reputation dropped, but I don't see anything listed!" from the relevant part of the FAQ post How do I read the history of my reputation? This bullet post is most likely ...
That's a community wiki answer, and you don't get any reputation for upvotes on them (nor do you lose any from downvotes). The idea behind this is that they're easy to edit (for everybody with at least 100 reputation) and are a collaborative effort, and therefore do not confer reputation. Since at the moment it's 100% your work, this might not be fair, but ...
Yes, that means the user has been suspended*. All you need to know about the situation is in the FAQ on Meta Stack Exchange:
When an account is suspended
The account will receive a private moderator message, explaining the exact details of the suspension and a box to contact moderators.1
The account will be locked at 1 reputation.
The user ...