Bishop Sanborn is a guardian of souls and defender of the faith. If there is an assault on the faith connected with the jab, it is only implicit; there is nothing explicitly against Christ or our Catholic faith about the jab in se. I understand the connections most Trad's make between the Great Reset, the vax, the lockdowns, etc. I would tend to agree there. But I see that a faithful shepherd - even without compromise to the faith - could take Bishop Sanborn's position.
The crux is Question 6 in Bishop Sanborn's memo. I think his reasoning there certainly defensible, but if there's any basis to question his judgment as in some way disqualifying, it's there. I haven't seen any reasoned objection that his position is in some ways disqualifying as to his position as a leader of the traditional cause of the faith on that ground.
Of course, this may simply be an issue of disagreement and objection to his view, which of course is fine and it is always a value in the search of being as close to the truth as we can to discuss these things. But to the extent that there is some suggestion that the Bishop's stance on this should detract from his standing in the trad community or such, that would be wrong in my view.