Nobody has stated that as the cause. We have speculated a lot, but there has also been speculation about design deficiencies and mechanical problems.
In some of the precedents cited, formal boards of inquiry have released probable cause statements in which it is determined that deliberate selection of beta mode in flight led to the accidents. Such is not the case here. All that has been released by the official investigative agency in this regard is that the propellers oversped by a considerable degree. There has been no determination by anyone (other than you) as to what caused the overspeed to occur.