At first the SSPX communiqué rehashes what the Holy Father did. Then…
The Society of Saint Pius X conveys its deep gratitude to the Holy Father for his pastoral solicitude as expressed in the letter from the Ecclesia Dei Commission, for the purpose of alleviating “any uncertainty regarding the validity of the sacrament of marriage”. Pope Francis clearly wishes that, as in the matter of confessions, all the faithful who want to marry in the presence of a priest of the Society of Saint Pius X can do so without any worries about the validity of the sacrament. It is to be hoped that all the bishops share this same pastoral solicitude. [Indeed, it is to be hoped!]
The priests of the Society of Saint Pius X will strive faithfully, as they have done since their ordination, to prepare future spouses for marriage according to the unchangeable doctrine of Christ about the unity [NB!] and indissolubility of this union (cf. Mt 19:6), before receiving the parties’ consent in the traditional rite of the Holy Church.
I like that bit about indissolubility.
The SSPX might not have had faculties to witness marriages, but I’ll bet none of their priests told couples anything screwy about the indissolubility of marriage. The SSPX might not have had faculties to receive confessions (they do now), but I’ll bet none of their priests told penitents that they didn’t have to have firm purpose of amendment.