I'm also a little skeptical that those words _triggered_ an investigation (if so, it would be pretty scary/amazing). But I have no doubt that once you're the target of a "terrorist" investigation, and the authorities are convinced you're the bad guy, they will find something and it will be enough to arrest/disappear you.

Or as someone put it long before I was born,

"If you give me six lines written by the hand of the most honest of men, I will find something in them which will hang him."