this is in general no false positive as neither the scanner nor any VT is creating such links on its own and it has been found / exists / is referenced on the target system.
There might be two reasons why the referenced file doesn’t exist:
The file is referenced in some HTML source code but doesn’t exist on the target anymore
The path isn’t build correctly in the reporting
In both cases the output of the following detection (This is a log message so the filter of the results needs to be adjusted accordingly) could give additional pointers where / how the file is referenced (please make sure to use a recent feed version):