NASA being involved then it's like a code of silence almost, these people involved have been bought? This is more than just split turbo design (the system that was being considered by Ferrari for '21) the parts involved in the mgu-h and mgu-k come under spotlight then.
It's interesting what Vowles said after the AD race and Perez's PU failure in Bahrain which was not that fully explained.
https://www.planetf1.com/news/mercedes-mgu-k-issue/