Spying on Americans? You could say that, perhaps, but you would have to say it about every law enforcement organization (including the local police) since 1776.
What the actual article is talking about is a massive extension, not covered by the regular "get a warrant in court" mechanism. Saying "just like the FBI" ignores how different this is, and how alien to the Constitution.
Secret courts on the other hand undermine the entire concept of rule of law and we should have absolutely zero tolerance for them.