SSPX Supports Vatican Charge that Archbishop Viganò is “Schismatic”

SSPX Supports Vatican Charge that Archbishop Viganò is “Schismatic”
David Martin | The Daily Knight
On June 24, the Society of St. Pius X founded by the late Archbishop Marcel Lefebvre issued a statement declaring Archbishop Carlo Maria Viganò to be “sedevacantist” because he denies the legitimacy of Pope Francis.
This is hypocritical. Why is it perfectly fine for SSPX members to reject Francis' legitimacy and a crime for Viganò to do the same? Is the SSPX envious of Vigano’s traditionality? Their statement attempts to differentiate Viganò from Lefebvre when in fact there is no essential difference between them.
The statement says:
“There is, however, one point which significantly differentiates him from the founder of the Society of Saint Pius X: Archbishop Viganò makes a clear declaration of Sedevacantism in his text. In other words, according to him, Pope Francis is not pope.”
Since when did Archbishop Viganò declare that all the popes since 1958 were antipopes?Sedevacantism …