This article is a bit all over the place. First, a slide deck to describe a codebase is not that useful. There's a reason why no one ever uses a slide deck for anything besides supporting an oral presentation. Most of these things in the post aren't new capabilities. The automation of workflows is indeed valuable and cool. Not sure what AGI has anything to do with it.
Also I don't trust it. They touched on that I think (I only skimmed). Plus you shouldn't need an LLM to understand a codebase. Just make it more understandable! Of course capital likes shortcuts and hacks to get the next feature out in Q3.
Having a thing that is interactive and which can answer questions is a very useful thing. A slide deck that sits around for the next person is probably not that great, I agree. But if you desperately want a slide deck, then an agent like Claude which can create it on demand is pretty good. If you want summaries of changes over time, or to know "what's the overall approach at a jargon-filled but still overview level explanation of how feature/behavior X is implemented?", an agent can generate a mediocre (but probably serviceable) answer to any of those by reading the repo. That's an amazing swiss-army knife to have in your pocket.
I really used to be a hater, and I really did not trust it, but just using the thing has left me unable to deny its utility.