I disagree. After signing Correa, I don't think the Twins will spend on a free agent outfielder, even a right handed hitting one. If they could trade Kepler for a comparable right handed hitter, they might do that. Otherwise, as I've noted in other threads, they have three number one draft choices (all LH hitters) who could break out and become lineup fixtures in the outfield. Gordon, Kirilloff and Larnach all could make the idea of having a platoon in the outfield a moot point. In addition, by midseason both Royce Lewis and Austin Martin may be available to help the club as right handed hitting outfielders, both likely to be serviceable backups for Buxton in center.
Last year in crunch time, Ryan Jeffers was injured. For the season, he OPSed over .900 against left handed pitching, so did Carlos Correa and Kyle Farmer. Having those three guys in the lineup most of the time against left handed pitching would make the need for an outfield lefty killer specialist much less urgent.
I think the Twins most urgent need right now is to augment their pitching staff. They have a lot of left handed hitting corner outfielders and one or two could be sacrificed to get more pitching. If they reduce the glut of corner OFs already on the roster, maybe they could add a right handed hitting outfielder more capable than Kyle Garlick.