Its specifically cockroaches they are talking about and ground coffee. If you grind your own beans and don't see any cockroaches or bugs, then your coffee is roach free.

Humans get allergies to cockroaches really easy. Living in cockroach infested areas will eventually create allergies, people who handle cocraches get allergies, it's not a question of if it's a question of when.

So if you have developed cockroach allergies you risk going into anaphylactic shock if you go anywhere where ground coffee is in the air like a gas station or coffee shop. If you aren't griding your own beans, there is some roach in your bean soup.

I forgot some details, but there were articles about it years ago, can just google it. And as far as i remember, bean coffee (self-ground or automat) has way less bugs.