It reads like the current fact is that they don't know why the ice didn't regenerate now. And then they follow up with basically saying this proves that rescin

It reads like the current fact is that they don't know why the ice didn't regenerate now. And then they follow up with basically saying this proves that rescinding ice does affect the Penguins, so 'future' (not current, as they haven't detected any changes) could affect them. I.e, it's speculation.