Oliver tells Diggle his father told that all the names in the list are evil.
Diggle asks how did that happen if Robert died before Oliver found the list.
Oliver says he found a message from his father telling that.
Diggle asks how he found a message if he spent five years in a deserted island.
Oliver doesn't say anything, but it becomes clear he didn't found it on the island.
Besides, he had to become a Russian mafia lieutenant somewhere.
Oh yes you're right. He even says he didn't find it on the island. I just never gave it a second thought.
