I got thrown a bit by the last draft because I fixated too much on it appearing differently to every individual when it was first discovered, and assumed that it would continue to appear to different people on an individual basis, if they had no preconceptions about its form due to reading SCP documentation. This draft makes it much more clear that the initial description is based off the incomplete knowledge the Foundation had at the time of discovery.
Anyways, the change you made solves the only real issue I had with the article. I am still a bit curious about the limits of the object's effect (for example, what would happen if there were two alternate documents distributed to different Sites of roughly equal population?) but it would be distracting to have too much document space devoted to experimenting with weird edge cases. You show a strong feel for pacing with the initial list of iterations as seen by the discoverers and first wave of Foundation researchers, and then again with the list of iterations as SCP-# gradually gets more and more self-referential (I can't quite explain why, but I do really like how SCP-# kind of seems to figure out how to be SCP-# one step at a time instead of all at once).
P.S. In the collapsible…
Description: SCP-████ is an object with an undeterminable appearance. It differs amongst individuals who observe it, such that no 2 individuals would perceive SCP-# as the same object.
Shouldn't SCP-# be SCP-████ here?