Did you not look at the results link for the virustotal results (Reply #3), that pretty much confirms it is a false positive. Not to mention one of the avast Virus Labs team confirming it is a false positive, which has been corrected. So I would tend to take their word for it.
The key wording in the link you gave is:
A few days ago we started getting messages from users saying that their antivirus software had started detecting Trojans in the Flashget directory.
So 'in the Flashget directory' is what is relevant and somewhat different to the actual executable being infected and since VT has 41 scanners you get a pretty good idea when only two scanners detect it that it is highly likely to be an FP.