The author mentions the situation in France. The fact that the Church is in a state of grave crisis in several European countries has little to do with the modern vs. old Mass.
That’s true. First, there is a grave crisis. Many folks here don’t want to see or admit it. Second, the causes are complex and not reducible to that one thing. But the key point in the article, and I’ve seen this explained with data elsewhere is this:
In France, in 20 years’ time a majority of priests will celebrate exclusively the traditional Latin mass.
The EF priestly communities are growing with young priests. Ordinations for the OF are shrinking (in France, anyway). This may not seem significant since, as you said, the TLM support is so small. However, Catholics will go where the priest is. If there’s only a TLM available, Catholics will go there for Mass - they have to. So, the situation does change over time.
In short, all orthodox Catholics are traditional, but traditional does not mean attached to the Latin Mass.
All orthodox Catholics are traditional since they adhere to the Tradition of the Church, yes. However, Catholics often have an option about what to believe, how to act and what to think. When a Catholic encounters an optional scenario - the traditional Catholic will always favor (not always choose, but just tend towards) the traditional (lower ‘t’) option - the time-honored Catholic concept, thought, practice.
A traditional Catholic reveres the Catholic heritage and past that has been handed down. This is much different from the modern Catholic - who may be orthodox- but who may (and often does) ridicule or even despise good aspects of the Catholic past and does not revere them. This could include even an irreverence towards saints, sacred art, spiritual teachings, pastoral guidance - many things. The modern Catholic judges everything from the modern perspective, thinking that contemporary ideas are always better than the past. Often, no effort is made to understand the people and ideas of our Catholic history. Secular sciences are upheld as superior to spiritual wisdom that was gained through much sacrifice and prayer in the past.
So, yes - every Catholic who adheres to the teaching of the Magisterium is a traditional Catholic in a certain way. But in another sense - no. In fact, Catholics who may be 100% orthodox can rip apart and destroy the Catholic tradition of our heritage without even caring about what they’re doing, leaving behind just a shell of the Faith - only the “minimum of what we need to believe”.
I see that here on CAF all the time.
But a traditional Catholic in the fuller sense realizes that the “unessential” heritage of Catholic tradition actually supports, fosters, builds and protects the Faith. Stripping all of that away, as we have mostly done in the modern age, leaves the Catholic Faith vulnerable and exposed to errors and dangers, even though the “mandatory teachings” are preserved. I believe we can see the results of that stripping down the Faith all over the world today.
Yes, some modern revisions and reforms have proven to be good. I’m not condemning it all. There is a certain prudential judgement needed. But let’s just say, many changes in the Church in contemporary times were done without good reasoning, argumentation or justification - and much of this has left the Church weaker in the face of secular and other hostilities.