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Quick question
can this be used if the marine chapter master is off the table?
Seems to satisfy the requirement of not moving.\

No.

While you do not need LOS to use this ability (Barrage), you DO need the ability to shoot.

Can ANY other model "shoot" or use ANY abilities while not deployed? No.

Since this counts as shooting a ranged weapon, if the model is not capable of taking such an action (inside a transport with no Fire Points, not deployed, killed, etc), then you cannot use this ability.