I think there is fairly widespread dissent within the SSPX on this issue, and find it odd the SSPX would issue a position paper which so many of its members will have difficulty accepting.
Fr. Lang (Germany), Fr. Byrne, Fr. Burfitt, Fr. Webber, and Fr. Robinson are just the tip of the iceberg representing a spectrum of dissenting opinions ranging from “it is never permissible to take the ναccιnє,” to “even if it was permissible under extreme conditions, such conditions do not exist with regard to CÖVÌD19 (or at least, they don’t yet exist”).