Yes, looking at their profile it does look that way for all their contributions on HN. Ctrl+F "real" and Ctrl+F "genuine" as one quick indicator--AI absolutely loves these adjectives and their forms right now.

Terse sentences? This is how I naturally write and think out loud and I assure you I'm not an LLM

Fair hit, though I'd like to push back slightly

On Mac, you can select a text you write, right click > Writing tools, which uses AI to rewrite and proofread.

Fair, English isn't my first language and I've been leaning on tooling. I'll dial it back.