Gibson isn't affiliated with the Society of St. Pius X, so Cardinal Gantin's declaration of ipso facto excommunication doesn't concern Gibson.
Also, the ipso facto declaration of Lefevbre and the bishops associated with him do not apply to anyone other than the bishops, let alone the faithful who attend Society chapels. In fact, recently Bishop Perle of the Eclessia Dei Commission said that it was permissable to attend Masses at Society chapels and even could even make a donation to the collection.
Finally, when the local Bishop of Hawaii declared five Catholics who attended the Society chapel in Honolulu excommunicated in 1993, Cardinal Ratzinger himself declared that the Bishop overstepped his authority and that the people who attended the chapel were Catholics in good standing.
You need more evidence to declare Gibson a schismatic than the fact that he attends a unauthorized Latin Mass.
I no longer care.