She is wrong... With the exception of the 'tell me what about it' ad-libs at the end (which have never been disputed and are indeed fantastic), everything is lipsynced. To be honest I find it rather surprising that someone could think these vocals are live..
In any case, I made a file with the audio she uploaded panned to the left and the studio acapella (that is, the center channel from the video version on the HIStory Vol II dvd - which explains the LOUD sound effects from the video in it, lol) panned to the right. I just EQ'ed the Brunei audio a bit so that the vocals stand out more. Here it is:
http://www.mediafire.com/listen/qqtp9f7oqu4vofd/escomp.mp3
The vocals are without a doubt the same. The only difference you might hear is some additional reverb in the Brunei audio. The audio files also did not have the exact same tempo. This is likely because of a file or tape conversion. I corrected for this, but did not spend much time on it, so if the two tracks go ever-so-slightly out of sync that's the reason. In any case, there is no doubt that it is playback right until the final 'hoo', which is noticeably different from the previous 'hoo's'. This is, not coincidentally, also exactly where the studio acapella ends.
Some other points:
1. She says she hears differences between the YouTube audio and the audio she uploaded. I'm 99.9% sure both files are the exact same source actually. However, the audio she uploaded is clipping badly (basically, the waveform is distorted because the volume was increased too much). I am almost certain that this is why she thinks she hears more 'raspiness' in her audio. The YouTube audio actually has the same amount of clipping, but because the volume on it is lower and the bit rate a bit lower, this is less noticeable. In other words, the 'raspiness' is the result of the waveform distortion, not a difference between the two sources or Michael's voice being raspier than usual.
2. This soundboard audio is not rare. It has been shared on MJ and bootleg forums for a very long time (pretty sure it's more than 10 years at least). I am happy to upload it if someone wants it, though I would not be surprised if there is still an active link in 2000 Watts.
3. I find it quite strange that she calls her upload 'indisputable evidence'. It proves nothing itself. She has also included an update in which she compares the YouTube audio with the audio she uploaded. I am again not sure what this comparison can prove. I think the only comparison that can prove anything is one between the studio vocals and the Brunei audio, like I posted above. I don't think it leaves room for doubt...