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He's done as an upgrade in Army Builder as a matter of functionality, not that he is actually a vehicle upgrade.
He is not available to the Space Wolves' army because he is not a vehicle upgrade. He is a unit selected by someone using Codex: Space Marines. That he is then assigned to a vehicle is irrelevant for purposes of this discussion.
Space Wolves use wargear from Codex: Space Marines. They do not use units from Codex: Space Marines except where directly noted in Codex: Space Wolves.
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