Yep. Color me shocked that the propaganda state media is unhappy with information being spread that doesn't conform to the views of the state, and so calls it propaganda or mis-/dis-information.
GP means "Ministry of Truth" in the Orwellian-sense. The "Ministry of Truth" was the propaganda arm of the government just as the "Ministry of Love" is the interrogation/torture and brainwashing center.
It's totally not the "ministry of truth".