could someone clarify whether the exploited coins made their way onto exchanges?
Only to the cryptox exchange, which is why the price crashed so low. No other exchanges were affected, as they froze deposits, so the illicit KMD couldn't enter the exchange.
The situation with cryptox is being worked on, and some deal & compensation will be made. The people that got cheap KMD cannot keep them as those were illicit KMD that no longer exist. Most likely they will get their money back.