What is that in blue in the map above ? Why does it say "Azerbaijani South" for blue areas ? [since i see the whole Turkia -except southeast-  is coloured in blue according to map ?]

Yes, makes one wonder, what is ment here by the term Azerbaijani?

When I look at the map, it´s clear that they all speak mutually understandable Turkish.

tunci ....This map shows the largest Turkish population in the world. A total of 110 Million people. 

Turkey´s predominantly Kurdish Southeast. Therefore map white.

He wants to say Turkey is Southern Azerbaijan. So?