I believe the article is claiming that the feature "blue eyes" has a single organism bottleneck (or origin) in the past. If this were also true for the feature

I believe the article is claiming that the feature "blue eyes" has a single organism bottleneck (or origin) in the past. If this were also true for the feature complex "human", that would be very surprising. If all that is being claimed here is that humans all have at least one common ancestor among many non-common ancestors, then sure that is trivially very likely. It is also nothing like what is being claimed about blue eyes IIUC...