It just means each tax would impose domestic taxes on corporations of at least a certain level. It’s not espousing any new taxing authority.
Germany and France are not the problem here, though. Ireland is. If you tell me Ireland and the Cayman Islands agree to this, then I think there’s a story here.
Typo: I meant “each country would impose domestic taxes...”
What you said is the most reasonable interpretation. But these days you never can tell.