Is this a correct rules interpretation, and is this intended behaviour? - A pilot transfers all game states to their TAG when they Mount it using a move order. - The Szalamandra pilot can enter impersonation state with their KHD. - The use of movement skills is not listed as an end condition for the Impersonation state. - This means the Impersonation state transfers to the Szalmandra when the pilot Mounts it using a move order.
No, it's not correct. See the last bullet point of the General Movement Rules: Mounting or dismounting will cancel the Hidden Deployment State, and any Marker State, of both profiles. My emphasis.