I read that. He doesn't give the message that is signed (just the digest and a screen shot of a small portion of the file). Without the actual data, this can't be verified.

> 'IFdyaWdodCwgaXQgaXMgbm90IHRoZSBzYW1lIGFzIGlmIEkgc2lnbiBDcmFpZyBXcmlnaHQsIFNhdG9zaGkuCgo='.decode('base64')

> ' Wright, it is not the same as if I sign Craig Wright, Satoshi.\n\n'

That's just a base64 encoded message.