Don't know if it is or isn't but in some ways it's better that it's not.
All the "Solar Pre-wire" means is that there are two small (about #12) wires going from the outside connector to the battery.
If you are going to install solar on the roof the pre-wire connector isn't used.
If you are going to use a Suitcase Solar system the connector is designed to force you into buying an expensive system (often ZAMP) and plug it in where THEY say it should be.
Starting fresh with no existing connectors allows you to install one where it's most convenient for YOU, not some design engineer at the factory.
Also, "Pre-Wire" does not include a controller so you either have to install one for the roof mounted units or purchase a "suitcase" that comes with a controller installed.
Just my feelings which may not be shared by all