I am a citizen of a foreign country but obtained my Bachelor degree in Germany. Does that mean I am a “Bildungsinländer” (somebody who obtained their university entrance qualification in Germany)?

No, “Bildungsinländer” are foreign citizens who attended a German school in Germany or abroad and in completing their schooling in this way obtained their university entrance qualification for Germany. Only obtaining a Bachelor degree in Germany does not confer the status of a “Bildungsinländer”. If, as a citizen of a foreign country you hold a foreign secondary school diploma and a German Bachelor degree, apply directly to OVGU.