That’s misleading at best. W76-2 began production a few years ago. B61-12 recently began production with B61-13 on the way. The current US stockpile may be down from its cold war height in bare numbers, but that’s not the point. The US is always improving its nuclear technology and refitting, upgrading, or re-manufacturing its existing stockpile. Clearly “wiping out humanity” is not enough.