For some reason, I cannot see the full-sized images when I click on them, meaning much of what you wrote is utterly ineligible. Is it because I'm currently using a smartphone?
If you're on smartphone, you may be better off opening the images in new tabs.
On the other hand, while the presentation concept is nice, and the execution is well done, it is unwieldy in practice - would it be possible to have your text copied into a spoiler tag to increase legibility?
Also, I hate to say this but... I feel like the choice to present the whole article as an epistolary exchange detracts from the content. A couple of exchanges at important moments can add life to the article, but replacing any and all body is actually sucking the breath out of it. You've clearly put a lot of effort into the presentation, but I fear we're missing a bit of meat on the bones before adding the skin on top.
From what I can tell, much of the article is currently focusing on the angle of the chapter being manipulated by the Inquisition. That's an important element, sure, but what I'd actually like to learn about is how the Fire Claws show their devotion to the Emperor; what do the purification rituals of the warrior cult entail; a specific example of how a Fire Claw rejected corruption; at least one non-standard method employed by the chapter prior to the Claws' involvement. All these elements feel crucial to the Fire Claws' identity, yet they are glossed over - I find the "choose your own adventure" aspect you're going for interesting, but fleshing out the Fire Claws' on their own wouldn't actually detract from that plan, and may in fact enhance it.
Sorry if I'm being harsh, but I've seen you avoid these kinds of pitfalls in the past, and I'd hate for you to feel like you were forced to post this at a specific time if you weren't ready to do so.
And here, I'm going to make another critique you may not want to hear: I think you should be writing all this for an entirely DIY chapter, entirely separate from a canonverse chapter. I know you love the Relictors, which is perfectly understandable, they are a very interesting chapter; but everyone knows what their ultimate outcome is in canonverse. Your whole "will they won't they fall" angle has a lot of potential, but the suspense has been shattered by multiple "official" publications like white dwarfs, codex supplements, and/or black library books; or else you're talking about an alternate "what-if" timeline like in the previous article, which can break the reader's immersion when they aren't expecting it.
When, really, most of this article could fairly easily be reworked into your own thing, your own chapter.
Again, I'm sorry for lacking in tact and diplomacy, but basically, I think you have a few great core concepts, but unfortunately they are currently clashing (in my opinion of course)