Although indicative of how BA thinks they have no direct bearing on the current dispute,
Except perhaps to subtly illustrate to union members that several of the 'current' issues are in fact the same 'old' issues, so that when the subject of non-protected action arises, union members may have access to a polite reminder that they are treading again on an old subject. Its also a not-so-subtle way of bypassing BASSA interpretation of what was said to them, and speaking directly to members.
Its easy to think you are protected in striking, should you not have been reminded of the issues previously raised by your union, but were (probably) never shown the response.