Unfortunately, this still doesn't appear to be working. I'm testing moving another volume from the same source and destination aggregates and using the -tiering-policy all option, and it's still appears to be moving all of the data:
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volume move show -vserver awssvm1 -volume erpauxdb1_u02
Vserver Name: awssvm1
Volume Name: erpauxdb1_u02
Actual Completion Time: -
Bytes Remaining: 8.30TB
Destination Aggregate: agg1_gp2_s3
Detailed Status: Transferring data: 246.0GB sent.
Estimated Time of Completion: Mon Jul 20 10:38:02 2020
Managing Node: awsclu1-01
Percentage Complete: 2%
Move Phase: replicating
Estimated Remaining Duration: 00:17:32
Replication Throughput: 8.07GB/s
Duration of Move: 01:27:08
Source Aggregate: agg1_st1_s3
Start Time of Move: Mon Jul 20 08:53:31 2020
Move State: healthy
Is Source Volume Encrypted: false
Encryption Key ID of Source Volume:
Is Destination Volume Encrypted: false
Encryption Key ID of Destination Volume:
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From volume show-footprint:
Total Footprint: 8.10TB
Total Footprint Percent:
Containing Aggregate Size: 5.32TB
Name for bin0: Performance Tier
Volume Footprint for bin0: 170.2GB
Volume Footprint bin0 Percent: 2%
Name for bin1: S3Bucket
Volume Footprint for bin1: 7.88TB
Volume Footprint bin1 Percent: 98%