I agree with their comment regarding his change of heart on bitcoin. I'm sure he came under immense pressure from the US government who, history has shown, will take any and all steps necessary to preserve the value and reserve status of the US dollar. I'm sure they won't take kindly to cryptocurrency threatening it's dominance.
I wouldn't be at all surprised if they threatened him with more than just removal of government subsidies.
As others have stated difficult to judge whether this video is even genuine. I suspect not! Given the level of Musk's trolling in recent months it was probably made by Elon himself!