The conclusion of the article you referenced is the opposite:

"Greenwald is not, as many of his critics lazily allege, a Russian agent; that would imply that his motivation is pecuniary rather than heartfelt. Greenwald remains what he has always been: a sincere enemy of liberal democracy and a genuine lickspittle for tyrants."

Glenn Greenwald is a real liberal democrat and fights for free speech. He even left "The Intercept" when they suppressed inconvenient facts.