Logline
When an existential crisis threatens to wipe out a beloved but infamous Star Trek species, a cadet is forced to confront his past and strained relationship with his family. As he pursues an unexpected method of coping, Nahla races against time to save this species from extinction.
Written by: Gaia Violo & Eric Anthony Glover
Directed by: Doug Aarniokoski


Caleb explicitly mentions the Prime Directive, stating that it doesn’t apply here, but without explaining why not. I always understood that this directive applies only to pre-warp societies, which the Klingon society is not, but I may be wrong.
The PD applies to all civilzations, but is more permissive with those that are already capable of FTL travel. When a species is out travelling the galaxy, you can interact and negotiate with them, but you can’t directly interfere with their business.
Caleb is leaning hard into the “pre-warp” side of it, as many fans tend to do, which is why he said those particular regulations don’t apply. He’s just conveniently ignoring the rest of the PD, assuming it’s still in force in the 32nd century.