He's not saying it's good is he? He's saying it would work, presumably in terms of eventually modifying the gene pool. I dunno.
It depends on the context that it's being used for. Like, if he's saying that we can use eugenics to breed out low IQ people as a way of increasing the intelligence of society for example, that's nonsense because IQ and intelligence in general is impossible to comprehensively define or accurately test for. For us to say whether he's right about whether it works means we need to ask what he's talking about. Eugenics for what purpose?
And in general, we don't really need to breed humans for any particular purpose. Like, we breed horses for sporting competitions as a way of recreation. No one truly NEEDS for a really fast horse to be bred nor does the horse benefit from it themselves. It's just a thing we do for shits and giggles to animals. It's not even really humane to the animals themselves, it's just a way obscenely rich people pass the time.
And he's doing this 'smart person says shit, is bewildered why everyone is upset with him for it', which I am miles past giving the benefit of the doubt for. He knows exactly why talking about eugenics is a hot topic issue and it's hardly the first time he's said dumb shit like this. We'll see I guess, but I wouldn't be surprised if this "I'm just stating the facts" is a deflection from the fact that he, idk, maybe defended the holocaust or whatever.