Look into the emerging literature around "needle-in-a-haystack" tests of LLM context windows. You'll see what the poster you're replying to is describing, in part. This can also be described as testing "how lazy is my LLM being when it comes to analyzing the input I've provided to it?" Hint: they can get quite lazy! I agree with the poster you replied to that "RAG my Obsidian"-type experiments with local models are middling at best. I'm optimistic things will get a lot better in the future, but it's hard to trust a lot of the 'insights' this blog post talks about, without intense QA-ing (if the author did it, which I doubt, considering their writing is also lazily mostly AI-assisted as well).