> this is what you do when you are the board of a public company
No, it's not. In a majority of cases where a public-company Board independently investigates its CEO, the CEO gets removed [1]. (And they're all announced like this. If you're in that 40% where you don't remove the CEO, you don't want to have burned them.)
If the Board still unconditionally trusted Jensen, they'd have him hire outside counsel to conduct an independent investigation of NVIDIA's security apparatus.
[1] https://www.gsb.stanford.edu/faculty-research/publications/s...
40% is a pretty high percentage where they don't get removed.