Thank you for the file. In this file
- GPS coordinates are recorded in XMP block, not in GPSDirectory EXIF block
- GPSDirectory does not contains coordinates, only references:
| + [GPS directory with 3 entries]
| | 0) GPSVersionID = 2 3 0 0
| | - Tag 0x0000 (4 bytes, int8u[4]):
| | 6218624: 02 03 00 00 [....]
| | 1) GPSLatitudeRef = S
| | - Tag 0x0001 (2 bytes, string[2]):
| | 6218630: 53 00 [S.]
| | 2) GPSLongitudeRef = E
| | - Tag 0x0003 (2 bytes, string[2]):
| | 621863c: 45 00 [E.]

LibRaw does not parse XMP blocks (and no plans for that), so it is unable to extract GPS data from such file.