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I suspect the down-votes come from the fact that:
There are rules against self promotion in the FAQ and link only answers aren't good answers as if and when the linked page goes dark the "answer" becomes useless.
The posters reputation is only relevant in that it shows that they are a new user who doesn't know the rules. A comment as to why the answer is a bad answer would have been nice, but there are no requirements on people to back up down-votes with comments.