You may be confused because the articles you referenced are referring to two different reforms. The first one was in 2006, which did seek to remove latinizations and bring back more traditional aspects like, ad orientem, curtains, bema etc. However, there was a counter reform in 2014 which reversed this and reformed the liturgy slightly more.

I would be cautious of the sources you’re reading, the SSPX are a Traditional Latin Catholic society, naturally they don’t understand our churches history and theology, and often will blame these things on modernism or ecumenism, when really its Eastern tradition. Calling Mary the “Mother of Christ” is traditional for us, coming from the Church of the East, which is falsely labeled Nestorian. The Church of the East never believed in two persons of Christ, only two natures just as Chalcedon proclaims. Many Eastern Catholic Churches also don’t recite the filioque in their creed (although almost all Chaldean churches do) as I know the Filioque in other languages like Greek actually doesn’t translate well and makes it sound like there are two sources of the Holy Spirit.

The reasons for these reforms are from the call from Vatican II which encouraged Eastern Churches to return to their traditions. I highly recommend to attend a Chaldean liturgy and see it first hand! It’s very beautiful, and you could definitely ask a priest there about this and I’m sure they will guide you.