UPenn’s actual statements are here and here.
“We appreciate that attending Penn is a tradition for many families. The Admissions Office identifies legacy applicants based on the information provided in a student’s application and defines “legacy” as being either a child or grandchild of alumni. Legacies who apply to Penn—like all applicants—receive thorough consideration in the application process.”
“Legacies who apply to Penn receive thorough consideration in the application process.”
These are even weaker statements on the subject than they previous had on their web pages, which said something to the effect of legacies who apply ED receive thorough consideration, but did not say that legacy is not considered during RD (so effectively stating that legacy ED >= legacy RD >= 0). But the current statements are even weaker than that.
Cornell does not seem to have any easily findable statement on the matter on its web site.