They most certainly are. An F-16 or what not droping 500lb bombs is heavily armed. Howitzer shells pounding a village is heavily armed.
RPG is an infantry weapon, and unless we're talking about RPG-30's, they definitely are light arms and pose no real strategic threat to Pakistan.
If you are saying they are lightly armed compared to Pakistan army then I'd agree, but they are heavily armed compared to the civilian areas they capture, civilians they loot, kill, harass, threaten etc.