That's not the schedule for the anime's premiere.
From what I can understand from the crappy google translation, it sounds like they're gonna air a documentary/behind the scenes about the anime's production, on June the 18th.
The anime is gonna premiere in July, as it has been known for a long...
I don't think Studio 4°C ever owned the rights to anything Berserk-related, specifically?
In fact, the notion of the studio adapting/animating a manga also owning any rights over the specific property is a very common misconception, I find. Of course, exceptions can be found, though it's rarer...