Sorry, it looks like some debug spam got into iTween.cs
Open iTween.cs and search for
void GenerateMoveByTargets(){
And delete:
foreach (var key in tweenArguments.Keys)
{
Debug.Log(key + ": " + tweenArguments[key]);
}
Please confirm if this removes the spam you're seeing.
Not sure if this was in the original iTween.cs or got added, but either way, will remove this in the next update.