Not sure if this has been noted previously - but the Fed Navy Ships in the all scout NHSS threats are hauling at least one Thargoid Sensor in their wing (per manifest scan), what they appear to be squawking about in their dialogue. Same dialogue as the Socho CG, but I didn't find any ships hauling anything unusual.
Also, not sure if this is relevant, in patrolling Lunguni between Doyle Landing and Lunguni 10 (the local ammonia world), when leaving Lunguni 10, at 12 - 13 light seconds it started spawning almost as many NHSS together as I'd seen in an hour, in other words, the dozen or so I'd seen in the last hour, I got another 6 to 8 in about 2 minutes. Not sure if this is just exception USS spawning logic or relevant. Never seen an other type of USS occur beyond the odd second or third as you are approaching.
Considering changing callsign to Not Sure