You cannot bulk export, archive or delete specific call recording segments instead of full recordings.

Call recording segments are generated temporarily by Genesys Cloud per playback demand, and do not exist long-term.   You can only manage the lifecycle of full recordings (for example, when they are archived or deleted).  

Bulk recording export to an S3 integration does not support exporting at the recording segment level.  Specifically, on the recording bulk job API, it does not recognize if the requesting user has the Recording > RecordingSegment > View permission, nor does it attempt to generate/export recording segments.  Only complete recordings are exported.