The point being that all priest in the Society are, apparently, not on the same page when it comes to indult attendance.
No of course they're not.
Inconsistency on this question is one of the many signs of decay in the modern SSPX. In France there is a fashion for getting married with two priests: an indult priest who does the exchange of vows and a Society priest who says the Mass. It is iniquitous, because it is tantamount to approving the old lie that SSPX marriages are not valid. But it happens all the time now. Fr. Chazal's niece was married that way.
The priests of the Society are not "on the same page" on the question of the legitimacy of the Novus Ordo, whether Vatican II should be thrown out or merely 'reformed', or whether it can be simply 'read in the light of Tradition', and so many more things besides. It has lost its unity after having first having seen a diminishing of its Apostolicity, its Catholicity and its holiness.
It might be useful to listen again to Fr. Pfeiffer explaining the crisis in the SSPX in relation to the Four Marks of the Church: