The policy book is old, and the party has said it is not their platform. Their platform was released last night.
No gun control in the current NDP platform. That's a fact.
You are free to believe that they have a hidden agenda, but don't present it as a fact. Just as you are free to believe the Liberals intend to bring back the gun registry, although they have said they wouldn't, or that the CPC intends further deregulation, which it has not promised and is not promising.
The platform is what the platform is.