There isn't a specific place, it's the general aesthetic. Maybe you do sound like an LLM :P I guess it's not unlikely to pick up some mannerisms from them when everyone is using them.
I guess I don't really mind the use of an LLM or not, it's more the style that sounds very samey with everything else. Whether it's an LLM or not is not very relevant, I guess.
I used Claude to expand on my ideas for a few of the purely informational things, and for formatting, but this article is largely written by hand.
For example "Interface tests are the ability to know what's wrong and explaining it." is in hindsight a confusing sentence. Many such cases.