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Seems like you can seal the sleeve to the building using whatever method you prefer and at both ends. The pipe can only be sealed on the interior end with flexible fire resistant compound.
Possibly the regs might be more concerned with the transmission of fire through the sleeve than a gas leak inside a sealed sleeve. Compartment sealing is a pretty big regulatory concern.
Airhead
What’s the principle here? You can’t seal around both ends of a bare pipe through a wall because if the pipe leaks you get a buildup of gas in the void? But you can seal both ends of a sleeve on a pipe to the wall? Or just one end?