When discussing individual persons who are in the process of converting to the Catholic Faith that is true (which is what you quoted). However, the Catholic Church has never taught that non-Catholic churches in and of themselves were in partial communion or any part of “the Church” (which is what I was referring to).
Oh, well when you are talking about the heretical communities themselves then, yeah, there you have a point. There’s no doubt that these communities have points in common with the Church, but it’s quite telling that the Catechism refuses to extend to them the name “churches”.