If Youngkin wins this election, it will be the umpteenth example of a strong Democratic turnout in early votes meaning nothing about the results of the election. I stopped drawing any encouragement from this after NC/FL in 2016.
Not drawing any conclusions from this is honestly the wise thing to do given how many variables we simply don’t know. This also doesn’t tell us anything about the actual margins in those places and whether Youngkin is winning over traditionally or recently D-leaning voters (just because people picked a D primary ballot last year doesn’t mean that they’re
all reliable Democrats). This also doesn’t tell us anything about how high election-day turnout will be (on either side, but especially among Republicans). I also wouldn’t subscribe to the "high turnout = always good for Democrats" assumption, even in D areas (that was disproven as well in many states in 2020).