About: http://webisa.webdatacommons.org/90723020

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Well as you said its semantically horrible and should be avoided, its impossible to tell if its impacting on the rankings as such as Google but it is definitely will not help rankings.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com