Looks like this was just never implemented. The signature to the
constructor for FarmTerminatedEvent is:
public function __construct($RemoveZoneFromDNS, $KeepElasticIPs,
$TermOnSyncFail, $KeepEBS)
The KeepElasticIPs and KeepEBS is where deleteCloudObjects is passed
in. These are dealt with later in event handlers, however nowhere is
there anything dealing with ELBs. This is most likely a bug.