Again, none of this has anything to do with what the book is about. You picked a word or two and went on a tangent completely unrelated to the topic at hand.

However, coming from a country that was directly in the path of Ottoman invasions

Well, I come from a country that was part of the Ottoman empire for half a millennium. I don't feel it gives me license to poop in every forum I participate in.

Should I have allowed the lie to proliferate, for the sake of the interesting discussion that might come about?

You can't make up umbrage to derail discussions into your personal hobbyhorse discussions, at least not here or the place gets worse. It's one of the basic conventions of the site.

Do you think predominantly Muslim ethnicities such as Bosnians or Albanians or Lipka/Crimean Tatars have a place in Europe then?

What does that have to do with allowing casual lies about history to go unchallenged? Let's say they do have a place - does that mean we have to whitewash the history of Muslim conquest? In other cases of descendants of invasions, they're made to call themselves 'settlers' and give land acknowledgments. The least we can do here is not tell lies.

None of this has anything to do with the book.