RE: TLV Extended IS Reachability (22) replacing IS Neighbor (2)
It appears if narrow (or old style) metrics are enabled, the IS Neighbor is sent. If wide metrics and Traffic Engineering are enabled, the Extended IS Reachability is sent. Since both can be enabled, both can be sent.
Juniper has a Caution about the effects of disabling both [KB25145]. If use wide metrics only and disable traffic engineering, no routing information is passed.