Standard Shader Emissive Warning?

tl;dr -- Why do I get the warning in the picture below?

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I'm following was marked as answered here: http://answers.unity3d.com/questions/914923/standard-shader-emission-control-via-script.html

However, there is one unspoken caveat. Apparently GI doesn't update on it's own, as observed here: http://answers.unity3d.com/questions/920023/change-materials-emission-scale-at-runtime.html

It turns out, that setting the "_EmissionColor" on the Standard Shader is not enough, we must also set the emissivity via DynamicGI.SetEmissive (although I see other posts using DynamicGI.UpdateMaterials: http://answers.unity3d.com/questions/919499/dynamicgisetemissive-not-working.html)

I have an empty room, with a cube that has a magenta emissive light. Technically, everything is visually correct (the surroundings receive emitted light), so I have nothing to worry about, except that I have the following warning on my editor, which is bugging me:

Searching for this specific error only yield one result in my Google searching: http://forum.unity3d.com/threads/unity-5-0-shader-assigning-movietexture-in-emission-map-slot-problem.309680/

I can only guess that this is due to not properly activating the shader variant related to Emissive lighting? I read about this here: http://docs.unity3d.com/Manual/MaterialsAccessingViaScript.html Granted, I'm not satisfying requirement #2, but as per the doc, I did enable the keywords and it should be enough:

Using the keywords above is enough to get your scripted Material modifications working while running in the editor.

My code below:

 public class IlluminatingWall : MonoBehaviour
 {
     [SerializeField]
     private Color wallColor;
 
     private Material wallMaterial;
     private readonly string shaderEmissiveName = "_EmissionColor";
     private readonly string shaderKeywordFeatureEmission = "_EMISSION";
 
     private const float enabledIntensity = 1.0f;
     private const float disabledIntensity = 0.0f;
 
     MeshRenderer myrend;
     // Use this for initialization
     void Start()
     {
         Shader.EnableKeyword(shaderKeywordFeatureEmission);
         wallMaterial = GetComponent<MeshRenderer>().sharedMaterial;
         wallMaterial.EnableKeyword(shaderKeywordFeatureEmission);
 
         myrend = GetComponent<MeshRenderer>();
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetButton("Fire1"))
         {
             Illuminate();
         }
         else
         {
             Dim();
         }
     }
 
     public void Illuminate()
     {
         wallMaterial.SetColor(shaderEmissiveName, wallColor * enabledIntensity);
         DynamicGI.SetEmissive(myrend, wallColor * enabledIntensity);
     }
     public void Dim()
     {
         wallMaterial.SetColor(shaderEmissiveName, wallColor * disabledIntensity);
         DynamicGI.SetEmissive(myrend, wallColor * disabledIntensity);
 
     }
 }

I even saw someone doing the same on a youtube tutorial here: https://youtu.be/h5GFoI38DOg?t=1136

I don't think I'm doing anything different from everyone else, so I'm guessing this has to do with some Material configuration?