In other words Robert, there will be no attempt to verify or justify the false accusations against bishop Williamson. The charges have been made and that should be enough.
Maybe you need to get with Fellay and give him the good news.
One condition of SSPX reconciliation, stated repeatedly, is that the excommunications be "lifted".
Clearly, invalid excommunications don't need to be "lifted".
You might like to bring this to the attention of the SSPX Superior and inform him that he's belaboring a nonexistent problem.