The Article you linked seems to be incorrect or at least different from my personal experience and a sentence from here (same wiki, different arictle).
“Ghost Sites can be found using the probe scanner, using probes. They shows up as cosmic signatures (type: Data sites), and occur in all categories of space (hi-sec, low-sec, null-sec and wormhole). They show up in the anomaly list as “ Covert Research Facility”. The is solely dependent on the security rating of the system: […]”
EDIT: I checked the article you linked in detail and noticed that that sentence hasn’t been changed since 2013ish, I changed it myself now. It is now similar to the article I linked.