The article implies that the Mira Murati and the rest of the C suite were the ones responsible for getting people to sign the letter threatening to quit unless the board resigned. And there seems to be some direct involvement from Microsoft (even before they announced they would hire employees who quit).
This sounds a lot different from the narrative that it was a grass roots show of support for Sam Altman.
If the CEO, the rest of the execs, and the investors in the for-profit were pushing employees to sign, doing so wasn’t a sign of loyalty to Altman at all.