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I just think it comes down to a fundamentally simple rule, which is that when you have a unit (or model in a unit, as clarified by the BRB FAQ ruling) in a transport, that radius effects involving them are measured to and from the transport's hull. This works consistently throughout the game, in literally more than a dozen different instances and every codex which has transports.

Yep, the p78 Embarking rule about measuring from the hull for "a range involving the embarked unit" is the core rule, with many, many clarifying faq entries affirming the general principle.