That’s agreeable to registering something. They are still a guess. There are also any number of seismic occurrences related to other events, like a volcano (many, many, many lower, 2.0 and below quakes). They know where they are but not always why they are.
Why not take advantage of this situation? Use the RFTG and remove problems in a precise manner, not leave any lingering radiation and maintain deniability.
The deep state howling about Gina Haspel, she know where all the black sites are. Spring cleaning with tungsten!