aws s3api list-object-versions --bucket $BUCKET_NAME \
  | jq -r '.DeleteMarkers | map(select(.LastModified >= "2019-01-20" and .IsLatest == true)) | .[] | .VersionId+" "+.Key' \
  | awk '{ print $1; print $2; }' \
  | parallel -N 2 \
    aws s3api delete-object \
    --bucket $BUCKET_NAME \
    --version-id "{1}" \
    --key "{2}"