this is like a theory and practice situation. in theory this is conflict of interest issue possibly undermines objectivity and so on. in practice Nvidia thrives and the man is a substantial reason of this. removing him will be plain stupid from the point of view of the company's performance.
replyCompany success has nothing to do with the conflicts of interest above though.
replyWhy should we assume corporate codes are morally just though? I do not. In fact I would argue this is evidence that company codes are in a general sense draconian and/or disconnected from social reality under capitalism, etc.
replyMany (most?) companies have specific policies against romantic relationships in the office, especially with subordinates.
replyIt isn't necessarily about morality if there are rules in place that all employees, c-suite or otherwise, are expected to follow.
I don't know Nvidia internal policy, but assuming their HR policies include such a stipulation it shouldn't be treated as a "rules for thee, not me for" situation.