Well it is hard to read true indian's post, but my interpretation of it is I'm not sure if only the VT comments column information was sent to avast or the file and the comments or what was sent.
Yes they get samples, but A) not in a timely fashion and B) they (avast labs member) reported that there is so much junk in there that it isn't that helpful. Which is why I feel it best not to rely on VT sending any sample and send it directly yourself.