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Reading through Hammer, I've come across the use of einer as determinative. One example the book gives is:
Der eine deutsche Tourist beschwerte sich.
How does this differ from
Ein deutscher Tourist beschwerte sich.
Both appear to mean the same thing, "One German tourist complained."
Ein deutscher Tourist beschwerte sich.
This simply means that there was a German tourist who complained.
Der eine deutsche Tourist beschwerte sich.
This implies that there was more than one German tourist (most likely two), and one of them complained.
So the first sentence translates to: A German tourist complained. The second translates to something like One German tourist complained [and the other(s) didn't]
Another possibility is that there was only one German tourist and that this tourist complained. Without context it is impossible to tell which meaning is the intended one.
The correct translation is:
The single German tourist complained.
There were no other German tourists available, which were satisfied. While your translation is not wrong, it loses considerable information.
Even though "der eine deutsche Tourist" can mean that there is only one, I disagree with the conclusion that this is the only correct interpretation. In German the expression "some people do this, others do that" is often used with singular, so it could also mean "der eine deutsche Tourist beschwert sich, der andere nimmt die Zustände klaglos hin".
codehighlights for quotations is not exactly recommended.