> Preferably, don’t give the AI access to the codebase. [...] If the AI does have access to the codebase, this access is read-only.

also

> I don’t follow all these religiously.

So if you need an overview of a system, you can and should provide access to the entire codebase. Even the rule itself says "preferably", not "don't ever". If you have different needs, you can always just look at it as a useful guideline. It's just a blog post by some rando on the internet, not the epiphany of AI coding's Ten Commandments.