Yes, but only released records, matched against the data services you already use.
Enrichment is the fourth of five stages: Connect, Collect, Review, Enrich and Deliver. Released records only are matched against the customer's data services. Unreleased contacts are never sent to a third party.
Sending unapproved contacts out for enrichment would share data nobody chose to share. Enriching only released records keeps the privacy promise and avoids paying to enrich contacts that will never be used.
See RelationLens.