Would it make you feel better if the sources were North Korean instead? Cause that is where your logic is going.
You know nothing of South Korea if you think anyone's objective there is to start a war. North Korea isn't some faraway land in the Middle East. If there's a war, it is South Korea that has the most to lose. -- But enough know how NK operates and don't want to be screwed over in a corrupted peace process either that is ripe for being hijacked but all kinds of sinister parties.
You could have just said, "I don't know".
Anyone who has paid any attention to Korea over the past few decades has at least a general idea of how NK operates so telling me SK Ingelligence folks do too isn't really saying much of anything.
In order to take this article seriously and be concerned about it your logic would have to be that Trump doesn’t have access to this intelligence or its equivalent.