That struck me as a red flag too, I wonder if he's really getting passed because his experience is all on stuff thats too small scale. Regardless, it doesn't so

That struck me as a red flag too, I wonder if he's really getting passed because his experience is all on stuff thats too small scale. Regardless, it doesn't sound like he actually did any interview prep, so it's not surprising he's getting negative responses. Even people who love this stuff have to brush up on the areas they don't frequently use (for work or fun).