This might be how they do things in certain parts of Europe, but Europe isn't the world. It might be that these bakers aren't experienced in making particular types of bread, and are relying on others who are.
An auto machanic of even 50 years ago wouldn't know how to work on today's automobiles, but they certainly couldn't deny that what we have today are indeed autos.
Sounds like they are specialized in making certain types of bread, but not all types. I don't think anyone knows how to make all types of breads.
There are breads that were made long ago, 10, 20 or even 30 thousand years ago that people no longer consume, and wouldn't want to if they were made today. However, there's no denying they were breads.
I don't think you can restrict what is considered bread based on the fact some bakers and some bakeries don't make them. A guitar manufacturer doesn't make didgeridoos, but they can't deny they are also musical instruments, made by a different process. People from any one part of the world do not have a monopoly on what would be considered the only acceptable variation.
The same goes for comments that flour tortillas aren't really tortillas because it's been relatively recently flour instead of corn has been used. All that means is that there is now another type of tortilla.
Over the millennium different ingredients have been added to or substituted any number of foods we eat today, to the point the original version would be barely recognizable to us. The way foods are cultivated have changed. What was considered fruit in the past would today just be sour, tiny, unpalatable fibrous pellets, best left to the birds. The grains that were used to make the first breads would look like weeds to us today.
Give us this day our daily bread. Do you think Jesus was talking about what your Siberian Bakery makes?