I don't think that H-R has ever outright admitted that. But it looks highly likely.
I don't think there was any centralized database of voting records. Hfboards posters (mostly
@BM67 ) painstakingly pulled listed voting totals from old newspaper articles and were able to reconstruct the large majority of the voting records. But occasionally there were missing votes.
At some point, someone (
@overpass ?) was in email contact with H-R and told us that the people at H-R were aware of the awards voting records on hfboards.
Then not that long afterwards, the data appeared on hockey-reference.com with the exact same missing votes as on hfboards. The only differences seem to be a few transcription errors that H-R made in copying the data from hfboards. The only transcription errors of which I am aware are all in Selke voting (maybe the intern in charge of entering that data wasn't as good as the others?)