You are right to question this usage. It's probably not what the creators wanted to say, but actually it's possible. For example, "When I return to Jakarta, "I go say hello" to my parents before I do anything else." To 'go say' something (or 'go do' something, or 'go see' someone) means you first find them (in the same building, the same town, the same city, the same country) and then you do the other action. Other examples, "Before I leave for New York, I want to go say goodbye to my friends." "She left yesterday to go help the flood victims." "Before I do my homework, I want to go check my messages." "He wants to go check Tribunnews.com to see whether there's any information about the official end of Ramadan." I hope this helps. Now, I'm going to go have some rendang for dinner.