Hello,
That's not correct. I have a feeling that the previous version contained a lot of spammy backlinks and they were part of the index too. We, on the other hand, have claimed backlinks through publications, press releases (the proper way) and never had the feeling we got rewarded for this effort. Competitors had claimed backlinks through linkbuilding campaign by marketing agencies. Their backlink profiles contained a lot of spammy links affecting the DA in a positive way. In my opinion that has changed.
So working hard refers to claiming backlinks as you should by blogging, press releases.
Best regards,
Simon