A couple things:
1. "Roughly three-quarters of hitters in today’s game bat right-handed."
I dont think that's accurate. Last year, for example, in the AL roughly 56% of PAs came as a RH batter.
https://www.baseball-reference.com/leagues/split.cgi?t=b&lg=AL&year=2025
It gets a little wonkie with relievers, because of pinch hitting and managers ability to sometimes limit platoon exposure, but Chafin, for example, in his career has faces 1275 RH hitters and 1013 LH hitters. Even with the changes brought by the 3-hitter minimum, last year Chafin faced 71 RH hitters, 72 LH hitters.
2. My belief is imbalance towards RH pitching has more to do with a scarcity of LH pitchers than a preference for RHed pitching.
3. In any case, while the platoon advantage in baseball is real and persistent, ability trumps handedness. The bigger problem for the Twins pen isnt too many LHers, it's too little ability.