The difference is that the previous non-profit was a not-for-profit corporation (gGmbh). This legal form is roughly analogous to most US non-profits (501(c)3 Inc.) and meant that as founder, Eugen Rochko still had more or less full control over the organization.

As I understand it, the new organization is supposed to be a non-profit association (e.V.), which is a distinct type of organization under German law that enforces democratic decision-making and enables people to become voting members of the NGO.

It's a bit difficult to explain as there is no analogue in most common law systems (sadly).