My interpretation is based on the ISO Correlation matrix which correlates 2015 8.7 with 2008 8.3, the latter which specifically refers to "product":
It also seems that the placement of 8.7 in clause 8, directly after 8.6 Release of products and services, indicates that 8.7 refers to nonconforming products or services, and not to nonconformances in outputs of intermediary steps.
It also seems that since 10.2 covers all nonconformities, whether they are input ncs, output ncs, process ncs, etc., that 8.7 would be redundant unless it had a particular intent.
I could be wrong...there's a first time for everything.