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My theories ...
Well... In normal times, it would make no sense as a Nyd Hive Fleet reclaims almost every scraps of bio-matter before moving on, including Nyd organism.
... However imagine that the Nyd consuming the planet (or perhaps a doomsday machine of the locals) triggered a huge volcanic eruption (or any other kind of world shattering), that could have forced the Nyd fleet to back off from a meal that had become too much trouble to consume AND leave a couple stranded Nyds behind.
The huge volcanic eruption would also create fertile soil for vegetation to thrive on.
However if the world was dead, dead ... A Jeanstealer Cult that sealed itself into underground vault whe the Nyd arrived, knowing what would happen and emerged again after they left ? The Cult's leading Nyd organism evolved into what is shown above and the Cult used stored machinery and equipment to terraform the planet. 5th generation, or pure jeanstealers, would be put to death systematically to ensure that their psychic presence do not call the Fleet back.