FWIW, digs I did on this decades ago uncovered that the man at the centre of the Whitlam sacking, Governor General John Kerr, was a paid C_A asset.
And because the dig was decades ago, I obviously have no sauce for this today.
But here's an article touching on the subject by that leftist controlled opposition faggot John Pilger.
https://www.theguardian.com/commentisfree/2014/oct/23/gough-whitlam-1975-coup-ended-australian-independence