I don’t think this qualifies as a slippery slope fallacy. The outcomes they describe have backing in the form of places like China and the claims aren’t extremely divergent from what can be expected of corps and govs.

The way you are applying it would mean precluding all outlooks with any negative future to them. It’s not wrong to foresee a bad outcome. What would be a slippery slope is if there were no reasonable examples of abuse of this kind of tech or examples of approaching the explained outcome. Alternatively if they took it to an extreme that wasn’t realistic in amy scenario like determining how many kids you were allowed to have who you could date/marry and all determined by a corp or gov.