The SSPX leadership has to placate two camps who would otherwise tear each other's guts out.
Statements like this are to reassure the hardliners that they won't be sold out for the sake of restoring juridical communion with Rome.
The hardliners' views may be unpalatably harsh, but these people provide much material and moral support. Bishop Fellay can't effectively negotiate to end the schism and fight rearguard actions at the same time.
The SSPX leadership has to placate two camps who would otherwise tear each other's guts out. Does one of those camps house the sedevacanists?
Statements like this are to reassure the hardliners that they won't be sold out for the sake of restoring juridical communion with Rome.
So, in essence, you are confirming that the SSPX cannot be reconciled with Rome unless the Novus Ordo mass is overturned and the Tridentine Rite restored in all churches around the globe? Are these the conditions set by the SSPX for full communion with Rome?