Thank you for the question.
The way I see it, since subclause 4(2) has been deleted and the pilot is not mentioned, the exporter is the only one who has an obligation: He must provide a written declaration that the horse is not being exported for slaughter or another document satisfactory to the minister.
The pilot is no longer mentioned. Previously, subclause 4(2) made the pilot responsible for receiving a copy of the declaration. Since that subclause has been deleted, the pilot's obligation has disappeared.