This plastic card telling you
Art des Titels
Aufenthaltserlaubnis
Anmerkung
30
already is the »Family Reunion Visa« you asked the German consulate for.
That 30 in the Anmerkungen field refers to § 30 AufenthG: Ehegattennachzug zu Ausländern.
Im am inclined to believe the German consulate. They are the official agency. As I understand it, this Aufenthaltserlaubnis stays valid until the expiration date as long as your husband does not leave Germany at the same time as you for more than 6 months, or for a job outside Germany. Caveat: in the latter case, both your husband's and your Aufenthaltserlaubnis becomes invalid immediately. Take care.
You can move to, from and inside the Schengen zone freely with that card.