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The Dornsife poll at least in 2016 operates in a rather odd manner: instead of polling a different set of voters in each iteration, it polls the same set of voters repeatedly to study how their voting intentions change. Because the pollsters sometimes miss some voters in their set, some of the variation results from slightly different subsets of voters taking the poll. In 2016, Dornsife happened to start with a set of voters that favored Trump (or at least consolidated fairly early behind Trump) to a greater extent than most media outlets prefer. After the election, the pollster corrected the poll weightings to shift the result four points toward Hillary.

This year, of course, Donsife uses a different set of voters. Each of 6000 persons answers the poll every fourteenth day. The identity of the respondents does not vary from poll to poll, resulting in a very stable poll.
Few Americans change their allegiance from one candidate to another during the election season; the President will lose this election unless his voters go to the polls and Biden fans do not cast their ballots. In spite—oops, make that “because”—of news coverage that shows completely dispirited Republicans who intend to sleep through Election Day without voting, I suspect that perhaps we have a chance that the coronavirus will spook enough Democrat partisans to avoid the polls, expecting victory nonetheless, and the mail voting system will confuse them too much to get those ballots submitted legally and counted.

Interesting insight into the methodology of the Dornsife poll. It does seem like the initial selection of participants would color the accuracy during the entire election cycle. It may or may not be meaningful. This year's group started with an advantage of 11 points for Biden. Is it a surprise that Biden still has an 11 point advantage?

Frankly, if you look at the concerns of the group... it does not seem to be in line with the concerns of the rest of the US Population.

I would also question your seeming assertion that Republican voters have been discouraged by the polls and news coverage enough to not vote. I am not sensing that with my friends and family and there is a wide “diversity” of opinions, level of enthusiasm, and political awareness.

To specify my skepticism with the concerns of the group. The economy is the top concern in most surveys, but uniting and healing racial divisions is not typically found to be the 2nd most important concern of voters.

I think this chart from Pew is far more accurate: