He might be referring to one of those "indultery" "masses" to which I would reply that you don't know.
how would you know, if the priest was conscrating hosts for distribution at communion, or using hosts already consecrated by someone else.
hosts for distribution
He's not talking about the priest, poche. He's talking about the ones the priest is
distributing.And the priest has one that is outside of the ciborium, separated from the rest of them. You can't consecrate a host again. Only once. The one he uses for his own communion is a non-consecrated host, separate from the rest of them. If he takes them out of the tabernacle to distribute, if there was a novus ordo mass there before, you really don't know if those came from the novus ordo or the Mass that he just said.
All you have is the priest's word. That's it. That's why it's so dangerous!