IMHO, the thing with the whole hunter biden laptop from hell saga is that it plays to a very small base of voters, most of whom are already decided voters. it's also out of step with the times: it worked in 2016 with hillary, so let's try it again.
the things people care about this year is COVID (dying, losing their healthcare coverage, etc.) and their jobs (precarious economic recovery, questionable continuation of government support/stimulus, etc.). hunter Biden's laptop is not important to voters.