This article is revisionist history. The Twins intended for DeSclafini to compete for the rotation, and expected him to be healthy. Mind-reading is not my forte, but when a well-connected beat reporter (Do-Hyoung Park) states that "[t]he Twins believe DeSclafani is healthy, and he could perhaps push Louie Varland out of the starting rotation," I'm inclined to take him at his word as to what insiders told him.
https://www.mlb.com/twins/news/twins-trade-jorge-polanco-to-mariners-in-5-player-deal
The Twins believed he was healthy.
It didn't prove to be so. That doesn't change the thinking at the time, which this article tries to portray.