sounds like you missed this part of the article:

<<In their Aug. 18 statement, the nuns said they have also made some liturgical changes at their monastery.

“In order to better render glory to God and “more profoundly to enter into the contemplation of His Sacred Mysteries,” the nuns said they have decided “to celebrate the Sacred Liturgy, the Holy Sacrifice of the Mass, the Divine Office, the sacraments, sacramentals and other rites according to the older forms of the Roman rite according to the traditional Discalced Carmelite usages.”>>

but yes, Vigano is a traditionalist. you don't get to exclude him from that identifier just because you don't like him. there is a significant overlap between traditionalists and support for Trump, and Church Militant is also a semi-traditionalist group- its opposition to some other traditionalist groups does not change that.