The Bundschuh - Liberty thing is canon I believe. If I recall correctly Geneva base is evidence for that. It is also the reason why the Bundschuh ID allows for allying with lawfuls against RM.
And even if it is not, it was never really a secret. VWA openly flew in Liberty and occasionally participated in the Rheinland war, etc. It is also in the Laws of Liberty and one may assume the laws are publicly accessible.