This article is not the first time I’ve ever heard of the ACLU. I read dozens of their cases in law school and attended lectures and conferences they’ve organized. I’m well aware of their history.
It’s true that civil liberties means more than just free speech. They’ve also done very important work in defending the rights of the accused, for example.
What they never were, until the organization was stolen, was a generic left of center organization that advocated whatever happened to be popular among that sector of society regardless of whether or not it had anything to do with civil liberties, or indeed were outright opposed.
There’s always been ideologues that thought that anything and everything else should give way before their moral certainty about everything. It just unfortunate that they’ve destroyed an institution that stood up for specific meta-principles.
Just b/c the article says it does not make it so. The ACLU has a broad agenda of things they defend. "Civil Liberties" does not just mean speech.