It's only with the Garden Party of KOD, with people refusing to believe Moridin was lying when he affected to believe Sammael was still around that many started doubting that what RJ had said long ago in a Q&A was correctly reported.
But there was no good reason to believe it wasn't correct, except for those in denial and totally convinced Sammael had been resurrected...
Mashadar captures or eat souls, we know this. He got Sammael's.