The thing was that at some point SIVA was intended to appear in D2 Nessus, there was a screenshot of a Nessus SIVA strike and lore regarding a potential SIVA cache on the Exodus Black. Considering the timeline of development and how D2 was shat out in like 16 months somebody made a very abrupt choice pretty late in the dev cycle to remove it. That itself isn't surprising but there has to be someone high up on the creative side that specifically has a hate boner to have kept it out despite the fact Destiny LOVES recycling content. The fact that the line was drawn against SIVA specifically meaning someone like a Justin Truman or Luke Smith was actively preventing them from milking it outside of aesthetics.
But yeah D2 Fallen factions suck. House of Wolves & Devil Splicers were the coolest the Fallen ever where and the House of Salvation shit we got was ASS
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Y'know, I swear I remember hearing that in-game at some point, or reading it in a lore entry, and everyone else basically agrees it's common knowledge to the point even the wiki mentions it as fact. But I just did a search through Ishtar Collective's database for "SIVA" specifically, and I can't find a single actual mention of SIVA on the Exodus Black. A couple of Ghost scans in the base game mention SIVA, but usually only if you were a veteran player, and none of them mention a cache of it on the ship itself.
So then I did a search on YouTube, and found a single idle dialogue line from Tyra Karn at the Farm:
As far as I can tell, this is the only source of this assumption, one piece of dialogue most people would probably end up missing, and not even a concrete mention of it being there. That's not to say it isn't logical it would be on the colony ships based on what it was designed for, just that a "just trust me bro" isn't solid evidence. Maybe Bungie had plans to do something more with SIVA there and decided against it, or maybe they never intended on it at all but put that line in for veterans to appreciate.
As for the strike screen, you always have to be careful with development assets, since they may not reflect anything that actually ends up in the game. They might have just come up with some placeholder text that could be easily identified as for developers only and not the live game. And as far as I'm aware, there isn't any concept art of SIVA related to D2 at all, which I feel like we would have seen at some point if it were actually planned.
ETA: TWAB goes live as soon as I post, fairly light, the only big news is a new community challenge for 250k Excision clears in a week (each player counts toward the total and GM difficulty counts sevenfold, so a normal clear adds 12 and a GM adds 84). It's a Monument of Triumph objective anyway, so good time to go do it. If the goal is met, everyone who played Excision this week gets a free emblem.