The previous article was about bikeshedding. This one is just about getting distracted.
By implication, this happens because the more complicated details of a project (e.g. designing a nuclear reactor in the original) or community are complicated and the domain of specific experts, and arguing about peripheral details (the color to paint the bike shed) is a way for the non-experts to show contributions.
I think both could probably be called bikeshedding, but it's interesting to make a distinction between the two.