Seems like it makes the point perfectly well. You are implying that smaller countries have fewer nukes because of US sanctions, but it could easily also be that those countries are simply smaller. Where it mattered, the US's main enemy, the US regulation did nothing to stop Russia from building as many nukes as they wanted to.
Also, the US has significantly less power worldwide than it did for most of that chart. Today, arguably, China exerts as much power as the US. American's always love to brag about how exceptional the US is, but often that isn't as true as they think and certainly won't be true for the long run.
Long term planning needs to avoid such arrogance.