Yes, the purpose of the Naloxone is to prevent IDU of Suboxone. Suboxone can still be abused by crushing and snorting (which essentially means that more Naloxone is absorbed).
Naloxone is only minimally absorbed sublingually and doesn't affect the BUP induction. After the BUP has dissolved, you can tell the patient to spit out the saliva if you are concerned about ongoing absorption of Naloxone.