The problem with analyzing or overinterpreting this (other than relying too much on what was always going to be an obvious D advantage in early voting that could also just be a cannibalization of D voters) is that it tells us nothing about whether Youngkin has made dramatic inroads into Democratic communities/rapidly D-trending areas. "High turnout in Richmond metro/outer NoVA" doesn’t mean much if McAuliffe's doing 15 points worse than Biden in these counties. "High turnout" in D/R areas isn’t good per se if the new/energized voters are likely to turn out against your party (also what happened in 2020 in IA/MT/Miami-Dade/etc.).
True, but beyond the Fox poll there isn’t any indication that Youngkin has done this