If someone is afraid for their life, regardless if there are objective measures for it being grounded or not, certainly casting it as baseless paranoia serves to dissuade such fears.
But that's exactly what this blog post does. It's like this is actually propaganda which was created to paint the author as paranoid.
He doesn't tell any real reasons for being afraid, he doesn't seem reasonable and rational at all. He comes to the encounter with preconceived notions and doesn't even try to doubt.
Police brutality and racism are awful issues, and posts like that do real harm because they paint them as paranoid delusions.
The appropriate thing for society to do about someone being in fear for their life is quite different in cases where that fear is justified from cases where that fear is baseless paranoia.