Howdy! As the author of the post in question I thought I might chime in if you don't mind.
A couple points, the first being that you aren't talking about slander which is spoken, you are referring to libel which is written.
The second being either type of defamation hinges on whether the accusation was false. As the only accusation in my article was that Mr. Spina had lied about the compensation his organization received I would have had to state that knowing it was baseless for it to qualify as defamation.
To the contrary I included the following:
- A screenshot of the statement in question
- An email from the GoldSeek organization showing ownership of a Waves wallet
- Excerpts from the blockchain of that wallet's activity
- Links to the source data and an invitation to the readers to examine the data themselves.
This would pass any rigor and be found, while unfavorable to Mr. Spina, far from libel.
I ask you to compare my content with this quote from the comment section of Mr. Spina's article entitled ZUR COIN PUMP & DUMP ALERT: Monkey Capital's DANIEL HARRISON Does It Again!
Here is directly accusing Daniel Harrison, by name, of an actual crime (theft) without any evidence to back that statement up. That would be defined as libel by most people.
It is obvious, 
@MinnowSupport, your comment on my article was the first I heard of you and I appreciate you putting there and have no problem that you wanted to remove it.
I'm also going to throw in some tags here just in case this post gets accidentally hidden.
RE: Slander on Steemit, Don't Do It! Here is Why.