Altman’s fission company’s design is specifically using conventional reactor waste fuel that’s processed and reused to power them. So those reduce nuclear waste, not increase it. In pausing the Oklo design (Altman’s fission investment company, he has a fusion and a fission investment) you would actually increase nuclear waste since it’s the only company in the US to publicly announce an effort to recycle fuel on a commercial scale.

Gates fission company has announced they are using the same type of fuel and the only logical source would also be recycling but they haven’t publicly confirmed it. So likely recycled but TBD.