I've listened to the whole sermon. i don't understand why you have serious concerns, dear friend. Because I'm french, I understood only about 90% of the sermon, but the 90% seem OK to me. I think that Fr Pfeiffer was right to speak about the fight in the sspx and not only about mystic life.
The carmelites, I am sure, weren't expecting something else. They have their books, their priest and their mother Superior to speak about mystic love. Fr Pfeiffer is specialized in the fight but still, in this sermon, he doesn't forget divine love. The carmelites are suffering right now because of the fight, so it was normal to speak about what they are suffering from, to comfort them and give them courage.
Perhaps you think that Fr Pfeiffer fights too much? I think that because he is the boss chosen last summer by the Resistance priests, it is normal. He could rest more if more other priests in the world were speaking out. But because there are only very few priests who are speaking out, those rare priests must speak a lot about the fight, to convince the weak, the shy and the hesitating ones...
Courage, my friend. I know it is not easy every day. But let's try to see what is essential and to be united on the main thing : the faith.