Favorables:
Lindsey Graham: 35/56 (-21)
Jaime Harrison: 35/28 (+7)
Tim Scott: 48/30 (+18)
Henry McMaster: 42/38 (+4)
Nikki Haley: 56/33 (+23)
Donald Trump: 51/47 (+4)
Joe Biden: 35/59 (-24)
The fact that Graham's favorables are where they are shows something IMO. And South Carolina is not a titanium R state, either.
I’d say a state that Democrats haven’t won since 1976 counts as Titanium R.
Anyway, nearly all the undecideds in this poll are Republicans. Safe R.
Since 1964, Democrats had never won Virginia until it went for Obama by six 2008. Minnesota hasn't voted Republican since 1972, but it very nearly went for Trump. Presidential winning streaks aren't perfect measures of whether or not a state is Titanium R.
South Carolina is still less Republican than, say, Alabama, Arkansas or Tennessee. Biden and Harrison won't win barring an absolutely huge collapse, but the races could be surprisingly close like the 2018 governor's race was. At the very least, it's marginally more likely to go D than Kentucky.