"Sarto" is the German equivalent of "Angelus Press" -- that is to say, the official book publishing organ of the SSPX in that country.
And they are sounding exactly like the FSSP in more and more ways!
Most recently, 2 of their books speak of the "Extraordinary form of the Roman Rite".
Gradual aggiornamento of the SSPX: the novelties of the publisher "Sarto" of the German district
We have pointed out previously the publications, each one more liberal, of the publisher Sarto of the SSPX German district.
This time we have found that in the announcements for the Missal and Roman Ritual (by the way, edited by the Fraternity of St. Peter) speak of "the extraordinary form of the Roman Rite".
http://nonpossumus-vcr.blogspot.com/2016/10/aggiornamento-gradual-de-la-fsspx-las.htmlAGGIORNAMENTO GRADUAL DE LA FSSPX: LAS NOVEDADES DE LA LIBRERÍA "SARTO" DEL DISTRITO DE ALEMANIA
Hemos señalado anteriormente las publicaciones cada vez más liberales de la Librería Sarto de la FSSPX de Alemania.
Esta vez hemos encontrado que en los anuncios del Misal y del Ritual Romanos (editados, además, por la Fraternidad San Pedro), hablan de “la forma extraordinaria del rito romano”.
"Ordinario de la Misa para la forma extraordinaria del rito romano. Dondequiera que la Santa Misa es celebrada de acuerdo a la forma extraordinaria del rito romano, es una gran ventaja dar a los fieles un misal compacto que facilite su comprensión profunda de los sagrados ritos" [...]
"Ritual Romano para la forma extraordinaria del Rito Romano."