Speaking of, had a bug report and some feedback.
So, w/r/t Nexerelin support, during the "tutorial" invasion at least, it appears that the Cataphract Strike option is available even without a Fenris in the fleet. I haven't had a chance to try a full invasion without one just yet, so I'm not sure if the bug is omnipresent. But it's definitely there in that circumstance - I was able to repeat it across multiple saves.
For feedback, I have to say that I'm... definitely not a fan of the Valkazard's defense fleet on non-Valk starts being as big as it is now, because in the end? The reward isn't worth the effort.
Like, make no mistake, I'm a huge fan of the Valkazard, it's one of my favorite mod superfrigates (well, essentially-frigate) and its start is the exact flavor of start I love, but it isn't so impactful that it needs to be locked behind a 300+ DP fleet of Redacted. At that point, you've essentially assembled your end-game fleet already and are mostly picking it up as a vanity item, which especially given that there appear(?) to be plans to attach a bit of a Questline™ to it, doesn't feel especially rewarding or impactful. Remember that the Planetary Shield colony item, a huge power multiplier for colonies, is guarded by only about 100-150 DP of ships, albeit one that's guaranteed to be a nasty Redacted capital. If anything, I feel like that's where the sweet spot for Valkazard acquisition would/should be; guarded by a Big Nasty Thing to make jetting over immediately to pick it up a dicey proposition at best, but not so huge and powerful a force that you can only contemplate going for it in the late game.
Still, this is all just from where I sit, and I don't have any idea what your long-term plans are or anything; this might all be part of an intended larger plan! But as the mod exists right now, in the moment, it doesn't feel great.