I dont think Burmester tweeter is visible as you are expecting. The photos look normal to me. If you go and look at any other Burmester W205 they are the same. I think the tweeter is in the corner of the window behind the black cover.
This site gives some breakdown of the Burmester system
Upgrading The W205 Burmester Audio
This site gives some breakdown of the Burmester system
Upgrading The W205 Burmester Audio