I think calling it libre or foss better shows that we are looking for user freedom as well as transparency, considering that companies like google are mostly associated with the phrase and if you ask people to name some open source projects, they will probably answer chromium and AOSP. so maybe it’s better to intentionally choose to say libre or foss instead of open source to make our goals and ideals clear?
Absolutely it makes sense to be doing like that to clearly lay down what’s the goals are. Instead of “merely” if it open sourced or not.
As you mentioned yourself it’s the freedom of the users that counts not if JUST the code is freely viewable and such.