The board seems truly incompetent here and looking at the member list it doesn't seem very surprising. A competent board should have asked for legal and professional advice before taking a drastic step like this. Instead the board thought it was a boxing match and tried to deliver a knockout punch before the market closes with blunt language. This might be the most incompetent board for an organisation of this size.
But that aside, how did so many clueless folks who understand neither the technology, or the legalese, nor have enough intelligence/acumen to forsee the immediate impact of their actions happen to be on the board of one of the most important tech companies?