This is believable with Trump +6.
Trump would win the U.S. Popular Vote by +3—which ties in with carrying 31 states—and likewise Republican pickups of Michigan and Pennsylvania by +5 and +4. (Based on increments of +1 for where each state ranks. Of course, the margins spread can be a bit more or less.)
In 2020, with his Democratic pickup for U.S. President, and Democratic pickups of this trio of top bellwether states, Joe Biden underperformed his margins in all three states vs. his U.S. Popular Vote.
ELECTION 2020◾️ U.S. Popular Vote: D+4.45
◾️ Michigan: D+2.78
◾️ Pennsylvania: D+1.17
◾️ Wisconsin: D+0.63
This was the first such occurrence—a Democratic winner who carried any of these three states—since 1944 (Pennsylvania and Michigan) and 1992 (Wisconsin).
I suspect, with a 2024 Republican pickup for U.S. President for Donald Trump, the margins in all three states—each a Republican pickup—will be higher than what he receives in the U.S. Popular Vote.