The configuration in the article is a Garden of Eden, but it is also a still life. Also, while the past is fixed, the future might look different from interference from outside.
It's technically not a Garden of Eden, because it has a predecessor, namely itself. But it is nearly a GoE, in the sense that it only has one predecessor.
The purpose of the cells in yellow is to turn the patch relevant to this discussion into a still life: it's already got the property of "must exist in gen N-1 if it is in gen N" without those yellows, but this serves to keep it from destabilizing instantly.
