Sean is wrong. It is those people who left the SSPX. Because Sean still goes to the SSPX he is compromised and can't give a proper answer.
The resistance is resisting the Conciliar church.
But we shouldn't be defined by what we are not. But rather what we are, namely the true Christian remnant.
BOD has been written about by theologians already before VII. Follow that.
Non dogmatic sedes are welcome in our circles, but most of us are not sedes. Our Bishops are not sedes.