Ngl, this really doesn’t mean that much. There were only a small fraction of voters who switched over, and many of them were in the suburbs (I.e. places Trump did terribly in in 2020 in particular, even more so than 2016) where Oz is supposed to be doing well (like in Chester county).
Fetterman is running more as someone who can win Erie county and NEPA by solid margins. Most of those voters actually stuck with Trump in 2020 so wouldn’t be included in the focus group.
Now whether Fetterman will end up winning many 2x Trump voters in reality is anyone’s guess. But that’s the theory and so the focus group is kinda silly.