Yaskoydri Technocracy/secret
Please also see Yaskoydri/secret.
Their claims about their history are mostly correct, though blurred by thousands of years of poor record keeping. Arrival in Datsatl Sector was around -6,750, give or take a quarter century.
Grandfather is well aware of their presence, and has decided not to reveal himself to them, or even openly contact the nearby droyne further (as he would be forced to acknowledge receipt of their message). They have technically obeyed his orders by stopping short, and for now he has far more important things to deal with. Besides, he was slightly grateful for their arrival, as that informed him what became of the Yaskoydri without his having to make another trip - but that was thousands of years ago. By 1105, they are to him just another human polity in Charted Space.
That they have encountered so many immigrants from coreward, while the rest of Charted Space has seen no such immigration as of 1105, is no coincidence. The Empress Wave drove many sophonts in its path, much like it would with the Zhodani Exodus. But where the Zhodani live over a span of merely a few sectors, the Empress Wave has crossed more than a hundred, over many thousands of years. Those sophonts that headed in the direction of Charted Space had a common guide.
Long ago, Grandfather gave the Yaskoydri rough maps of the galaxy, including the rough location of humaniti's homeworld, along with a directive not to seek it out. While only he knows what he was thinking, it is reasonable to assume that he thought some Yaskoydri might someday disobey his directive; indeed, some in the Technocracy believe this was a knowing encouragement to someday do it, but only in dire need (such as the extermination of their core civilization). The maps show the best approach to be a route that passes through the area the polities of Charted Space have named Datsatl Sector. (The maps were software, not unchanging data, which accounted for stellar drift. They did not account for the Final War; finding some of the expected worlds shattered, and some of the stars missing entirely, contributed to the Technocracy's decision to stop in Datsatl.) Many of the immigrants have been fellow yaskoydri who settled to coreward only to evacuate with the Empress Wave; others either followed the yaskoydri, traveled with them, or got the maps from them by means fair or foul. Some of the latter group thought the maps pointed to shelter, others to a place to loot; all knew there was something of interest in the marked region, which made for a better bet than striking out across unknown space. (Those who did prefer to strike out across unknown space, went somewhere other than Charted Space.)
Whoever they were and however they arrived, they arrived into the space occupied by the Yaskoydri Technocracy, and had to deal with them. All were absorbed or destroyed; few had cause to press on through the Technocracy, and none of those with cause proved strong enough after their long migration. While their arrival always changed the Technocracy - most in very minor ways (there are many tales of the would-be conquerors where the biggest "change" was that the Technocracy would forever after be without the specific hundred missiles it took to destroy their small, exhausted fleet; a common joke is to list every resulting piece of paperwork and logistics, and note that specific thing would not otherwise have happened), a few in large ways - in every case, the resulting surviving polity still thought of itself as the Technocracy. As far as the rest of Charted Space is concerned, the Technocracy has simply always been there since its founding, even if a more detailed historical examination might liken it more to a series of Ramshackle Empires. Even the Pirians, who have great experience with the rise and fall of the Technocracy, tend to underestimate this.