It's typically express techs
It's typically express techs that do those inspections, ie very new non certified techs, sometimes with no prior experience; they make mistakes sometimes. If it was a tech that came to talk to you it sounds like you weren't actually at a dealership, I've never known a dealership to send a tech to speak with a customer (unless they specifically request it) because they have a specific position for that usually called service advisor or service consultant. I do a lot of traveling and have been to many different dealerships for service.
Also at dealerships if you ask to be shown something, they'll usually escort you back to your car so you can see for yourself. I have yet to be turned down when I've asked. Locally, I have two techs that I trust, one at a dealership, one at a very small mom and pop.
Doesn't really matter where you go, there are trustworthy people and bad apples.