That's 38 more than the official number, because I mapped it out myself for Pitt. Obviously, the vast majority are plots with existing buildings taking up the entire footprint, not greenspace. It includes the entirety of Oakland, including things like the Mellwood Ave maintenance facility and buildings that are leased out long term (like the Rand Building) which may or may not be considered "campus". It doesn't include Commonwealth owned lots, like Hillman library, which would bring it up to about 190 acres, nor UPMC owned buildings.
What you also have to consider is this number includes Pitt's medical school and university owned research facilities. Many schools have med schools off campus or miles away from their undergrad campus. Pitt's health sciences are all crammed onto the undergrad campus.
Also, compare the # of students per acre. Pitt is way, way, way, way more compact and land starved than just about any single D1 football playing school, or really, most other major research universities.
BTW, a conservative estimate for the footprint for a football stadium would be about 15 acres (or about 9% of existing acreage owned by Pitt in Oakland). Many modern facilities take 50 or more (so like 30% of Pitt's existing Oakland acreage). But hey, Pitt has 4,700 acres in Wyoming for about 6,500 acres total among all the regional campuses and other lab sites.