Ehm, yeah. Surely it does. You missed the point.If it screens antibodies, it has the problem of every quick test: The time lag between infection and the reaction of the immune system. Same as HIV quick tests eg.
How do I put it... there could be tests developed that accidentally react pos. but you are not actually infected by Corona because the virus you got is similar to Corona and causes an reaction but would actually be harmless.
The question then would be how successful is the result of the quick test compared to the result of the test developed by the Charité. Are all results the same? (Pos/neg alike) If so then its an okay price.