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The references to the Rangdan do mention the phrase 'slaugth murder-minds'

The Slaugth ARE a fairly fleshed-out thing in the Dark Heresy RPG - I have a sneaking suspicion they're essentially Rangdan survivors.
The Calixis sector is on the Northern edge of the Imperium, which is where the Xenocides took place

They are very much a scary monster, being essentially sentient maggot swarm colonies, all of which are low-grade pariahs, with a habit of wearing a "people skinsuit" to infiltrate and manipulate and a taste for Human brain matter, preferably slightly rotting.

Note this also lines up with calling the Rangdan 'Cerebravores' and that those wounded in the Xenocides inevitably have massive facial scars.


https://warhammer40k.fandom.com/wiki/Slaugth

If they were trying to hide the 2nd and 11th, it wasn't just 'they lost', but something about the way they lost.

Slaugth infestation controlling them is possible - if a legion was compromised wholesale, especially a primarch, the Imperium would try to sweep it under the carpet. But that doesn't really explain the primarchs agreeing to hide it from THEMSELVES.
That feels like 'the truth' - whatever it is - would threaten the entire Imperium.

Two theories spring to mind.
1) One exotic ability the Slaugth are supposed to have is extracting memories from the brain matter they consume. By complete coincidence, that capability is one of the biotech implant that make up astartes geneseed, and unlike stronger-faster-tougher isn't an obvious combat augmentation. Were the astartes compromised and vulnerable to control from day one by the use of slaugth/Rangdan biotech in their makeup, and how did that end up there if it did?

2) the emperor eventually won by 'breaking the labyrinth of night'- shorn of poetry, that means bringing out the Ctan Dragon he stashed there and using it as a weaponised super-duper-transcendant ctan, before putting it back (since it's still there as of the HH book series). Which would raise the question of the witnesses - and worse the Mechanicum - asking "WTF was that?", a question whose answer would potentially plunge Mars into civil war and undo the treaty of Olympus.