Well, take a look at the average board of directors and you'll see what is not diverse. Straight white men who went to a handful of schools and universities, capable and dedicated I'm sure but they'll have similar experiences and ways of thinking.
Diverse doesn't mean abnormal. It means a mix of viewpoints. It's proven to deliver better results.
It is hard to define though, eg does class background count, mental health conditions, what counts as a disability, does race count and at what point (eg two individuals with the same mixed heritage might have different relationships to their identity). Lots of people from ethnic minority backgrounds still have hugely privileged upbringings (rishi sunak springs to mind). And so on and so on.
But the initiative to want more than lip service to diversity is a good thing.
Of course, the more challenging side of diversity is ensuring a good pipeline of talent, which means better recruitment, company culture, family friendliness etc etc