I was told by one of the SSPX priest to avoid it at all cost.
Yes, we've seen individual priests come out against the jab, but as a group and quasi-officially, the SSPX has been condoning it and throwing those seeking religious exemptions under the bus.
Now, Fr. Robinson's letter said religious exemptions are personal and so the priests wouldn't sign them ... because they think the jab is OK. But I have since learned that some applications for religious exemption do require a signature from some religious leader.