Haarms would help SU, but except for being 7-3 and 250 lbs., I'm not sure why he's attracting so much attention. It looks like 6-9, 270 lb. junior Trevion Williams was getting more minutes at center than Haarms as the 2019-20 season went on. Haarms did not start many of those later games, according to the ESPN box scores. Purdue's stats page indicates that Haarms played fewer than 20 minutes in over half of their games, and averaged only 4.6 rebounds per game. He only played more than 30 minutes in one game in 2019-20.
On the bright side, despite his limited minutes, Haarms averaged 8.6 points and 2 blocks per game for the season. In fairness, though, he missed some time in the middle of the season due to a concussion.
In comparison, Sidibe averaged a couple of minutes more per game than Haarms (23), averaging more rebounds (7.6), 6 points and 1.4 blocks per game in 2019-20. The improving Sidibe averaged at least 10 rebounds in the last 6 ACC games, with 3 double doubles.