So basically the email is stating that attacking does not equal being active in the combat phase? That seems....odd.
Why? The rules state that a ship can only be the active ship once in the combat phase. There's nothing on any upgrade that allows shooting outside of the normal activation that states that the ship becomes active or that the upgrade the ship to become active more than once per phase.
Being able to perform an action in the activation phase ( via Squad Leader, Lando, etc. ) doesn't make the ship performing the action the active ship, why would attacking be any different?
Well, for example if a btl equipped y wing destroys a target with the same PS with the second attack that ship does not get to attack, as the y wing was only technically active for the first attack. The second attack basically happens in this weird time between the end of the y wings activation and the next ship activating.
But that's not true. Attack. Trigger after attack abilities (btla4 attack). Resolve and trigger any further after attack abilities. Resolve those and then end activation. Rolling the dice doesn't somehow end your activation before all the after attack triggers resolve.