Don't have time to look it up now, but did Satoshi sign lzsaver's key as well? If not then the signature indicates nothing. I could generate a key called
obama@whitehouse.gov and use it to sign Satoshi's key. There's no way for him to approve or disavow my signature, unless he also signs my key, indicating he accepts its validity.
Best practices call for exchanging key fingerprints in person, and showing government identification, before signing someone's key, so:
(a) you have established their real-world identity is valid, and
(b) that they do indeed control the key in question and there isn't a MiTM attack.
Since none of the key community members have actually been able to do this, it makes sense that they haven't signed his key.
