SARP tier stealth technology is not easy to come by legally (Though it's not exactly hard either), but I would be shocked if there were no black market dealers for it. You know, the kind that a shady corporation would deal with? I would think it's entirely reasonable for
Psychopomp to have shielded their base with
Zanarium, which is noted to have made its way through back channels to various nations, and a
Mass Mesher, which given the recent fairly lengthy war, would not have been too difficult to acquire from illegal salvage.
To top that off, there are less advanced stealth systems that are also incredibly useful for masking signatures, such as cooling systems and faraday cages, which more conventionally reduce or eliminate EM emissions.
In regards to the comment that the Psychopomp page might not be up to wiki standards, we don't have any for companies but the page is fine. In regards to the one that the company page might not accurately represent Pyschopomp's holdings, I'll refer to
this section on the Psychopomp page. Finally, in regards to RP, there's been a lot of RP that
either directly or indirectly involves Psychopomp, it's not as if this is some company that's not had any bearing on RP, quite the opposite. In fact, there's
RP specifically taking place in 87D, which held the training center for Psychopomp's PMCs.