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Slander is the oral word of something that is untrue and is stated as "fact" knowing that the statement is not the truth.
What you are describing is "Libel" and that is the written word of something that is untrue and is stated as "fact" knowing that the statement is not the truth.
Now, if a person state's something as "opinion" that is not stated as "fact" and so there is no defamation
in the form of libel or slander.
Further the truth is a defense to a defamation lawsuit - meaning if there is any truth to something stated as fact and not prefaced with "In my opinion" or "It is my opinion" then the person who brings such a lawsuit would have a hard time winning it.
Therefore, it is hard to sue for defamation, and it is definitely hard to find an attorney to handle such matters.