The pure numbers looks like this...
2022 Vaughn
xwOBA: .319
wOBA: .327
2023 Vaughn
xwOBA: .319
wOBA: .321
2024 Vaughn
xwOBA: .319
wOBA: .304
As his actual production gradually tapered off over the last three years, Vaughn's under the hood expected StatCast numbers stayed very consistent.
2025 Vaughn
xwOBA: .354
wOBA: .290
Unfortunately StatCast doesn't break down expected wOBA by team, but it's easy to see the Vaughn from this year is a different hitter under the hood than the Vaughn from the last three years.
Now of course no one should expect him to keep up the .475 wOBA he's got with the Brewers so far, that would be preposterous. But we also shouldn't be giving very much weight to the .231 wOBA he posted with the White Sox earlier this year as there was clearly as much or more bad luck in there than there is good luck in what he's doing now.
Some guys with an actual wOBA in the range of Vaughn's .354 xwOBA this year are Matt Olson (.356 wOBA), Tatis Jr. (.355 wOBA), Gunnar Henderson (.353 wOBA), Mike Trout (.351 wOBA) and Bobby Witt (.351 wOBA).