This is definitely data from a SIEMENS scanner and it looks like I'm using the most recent version "ConversionSoftwareVersion": "v1.0.20171215 (OpenJPEG build) Clang8.1.0" although the link you provided just brings me to a blank page. These scans are rather old and it may not be possible to to get the required info from the scanner console, in that case is there no hope of recovering this information?

Also when viewing the DICOM with DICOMBrowser it does have a line that reads "(0029,0010) Private Creator Data Element Keep SIEMENS CSA HEADER" does that mean that it is still there and hasn't been removed?