For sure, I can see how outdated mapping data will influence what the sim renders for terrain.
What I find weird about my, specific, situation as mentioned in my OP, is the fact that the US Government’s Federal Aviation Administration database has this airfield clearly specified as Closed Indefinitely.
For the USA, I’d have thought there would be a regular cross-check of data for the sim whenever the navdata updates are issued.
Of course, errors occur and items can be missed due to a mistype or some other data entry mistake. Nonetheless, it still surprises me.