Simple-KML unable to find gx:coord for a KML file

[phileo]

I have this kml file:
https://drive.google.com/file/d/0B6n-0chrqAAMbHhwRmwzSWFxNUU/edit?usp=sharing

When I run Simple-KML to parse it, I can the track and the schemaUrl, but not the gx:coord and timestamps. Any ideas why this is happening ?

Here is my code:

Document feature = (Document)kmlResult.getFeature(); 
for (Feature f : feature.getFeatureList()) {
        Placemark placemark = (Placemark)f;
        for (Geometry g : placemark.getGeometryList()) {
            if (g instanceof MultiTrack) {
                try {
                    MultiTrack thisTrackSet = (MultiTrack)g;
                    Log.d(TAG, thisTrackSet.getAltitudeMode());
                    Log.i(TAG, "number of tracks: " +thisTrackSet.getTrackList().size() );

                    for (Track t: thisTrackSet.getTrackList() ) {

                        Log.i(TAG, "number of schemaUrl: " + t.getExtendedData().getSchemaDataList().size());
                        for (SchemaData url:t.getExtendedData().getSchemaDataList()  ) {
                            Log.d(TAG, "url: "+url.getSchemaUrl() );
                        }

                        Log.i(TAG, t.getCoord() );
                        Log.i(TAG, t.getWhen());
                        counter++;
                    }
                    ....