These programming languages aren't non-existant, and can be verified as actually existing. It's not that there are no references to it.
On top of that, i'm still unclear why it would even matter? Things with little interest will generate little traffic. The potential to misinform is pretty low. And if it were to be the case that an article that was incorrect (maliciously or not) were to suddenly see an increase in traffic, presumably that can only serve to encourage people to point out inaccuracies and correct them (treating fictionalized accounts of anything as being an inaccuracy). And wikipedia already has a mechanism for resolving synonymy and name-resolution disputes.