The page doesn't make it very clear, but the analysis at the bottom says that is a message that the German recipient tried to decode in several different ways a

The page doesn't make it very clear, but the analysis at the bottom says that is a message that the German recipient tried to decode in several different ways and then gave up. Apparently the message indicates the key (indicator group?) twice, but was VA in one place and VR in another, so the message was clearly received corrupted. Neither indicator worked so the recipient tried other things that also didn't work. Given that the message is corrupted and the recipient with the key couldn't decode it, it's not surprising that the message remains unbroken. Even brute force isn't going to work if you start with garbage.