Well, it's obvious that Fr. Pfiffer/Hewco accept his legitimacy because he has celebrated mass in the chapel at least once.
I remember when Fr. Pfiffer was bashing Bishop Williamson for inviting over an orthodox Jєωιѕн rabbi at the seminary for a talk on social morals. Now, Fr. Pfiffer is inviting this man, Bishop Ambrose or Mora or whatever he refers to himself, to, not only speak but, also, to perform the sacraments.