Do these OPS numbers at AAA suggest the players can play at the major league level? Possibly; I'm not going to dig into them here to consider them further. But the players won't likely replicate those numbers with the big club, because the pitching in the minors is so much lesser and the offensive environment is elevated - league-wide the OPS this year in the International League is .771 at last check, with an ERA of 4.92. Racking up an OPS in the .800s there doesn't really make anyone stand out, since the numbers are being compiled against players who for the most part belong in AAA anyway.
So it's a bit of a stretch to believe they can "upgrade" anything on the Twins' offense, except players like Kirilloff who are absolutely struggling. These four, even the vaunted Lee at the moment, represent more of a wave of reinforcements than an upgrade.