I think that's the critical difference between your perspective and the perspective of people who are worried about it. China does engage in espionage, as does every other state. Every state also has tries to defend themselves from espionage, and they especially don't want to fund espionage by what is quickly becoming a near-peer adversary.

They're bothering because they think it's a problem. You don't, but you're probably also not the US intelligence apparatus whose job it is to think about this.

I'm sure if these are legitimate paperwork errors, people aren't going to be getting into serious trouble. However, security lapses and intrusions often manifest and are most detectable as, you guessed it, paperwork errors.