Let's see, the analysis states that the Pope awaits with open arms the return of the SSPX. If they are not apart, how can the Pope be described as waiting for their "return." If they are not scismatic, why is an agreement needed?
The article also makes a point several times, that the SSPX is not in "formal schism." So now we are to believe there are two possible states: formal schism and informal schism. Utter nonsense.
As part of the argument, the artcle points out that a Catholic who attended an SSPX Mass was not a scismatic. That is also true of a Catholic, who out of necessity, attended an Eastern Orthodox Mass to fulfill his Sunday obligation. But it does not change the fact the Eastern Orthodox churches are, in fact, scismatic.
The argument does not wash.
Cardinal Hoyos was the competent Vatican authority at the time, and Pope Benedict wrote the following when he lifted the excommunication of the SSPX bishops in 2009.
"This disciplinary level needs to be distinguished from the doctrinal level. The fact that the Society of Saint Pius X does not possess a canonical status in the Church is not, in the end, based on disciplinary but on doctrinal reasons. As long as the Society does not have a canonical status in the Church, its ministers do not exercise legitimate ministries in the Church. There needs to be a distinction, then, between the disciplinary level, which deals with individuals as such, and the doctrinal level, at which ministry and institution are involved. In order to make this clear once again: until the doctrinal questions are clarified, the Society has no canonical status in the Church, and its ministers even though they have been freed of the ecclesiastical penalty do not legitimately exercise any ministry in the Church."
I guess you are being more Catholic than the Pope.