What happened when the new Corolla struggled with the small front overlap test? Toyota fixed it immediately in the following year - before it was even due for a facelift.
What does Tesla do? Complain and attempt to discredit the IIHS.
I appreciate all that the IIHS has done to advance automotive safety while the NHTSA just sits back, and I am glad that many established automakers take the IIHS tests very seriously.