There are a few different definitions for that word, so I presume they're going for the "to harm someone's reputation by criticizing them" definition, rather than "to pronounce the sounds of a word in a way that is wrong or not clear"
That was also my impression. One of my first thoughts was "They may as well have just called it Libel".
Personally, I think it is a pretty stupid name given either interpretation. Slur does not denote reliability of information.
Agreed. Whichever meaning it invokes, it's not a good name.