I'm not personally familiar with any of the folks who work at AoA. But like many people I spent years assisting people who had technical difficulties with equipment which they knew how to use, but not how to troubleshoot or repair. Our Help Desk staff would often cite 'user error' when we discussed the weekly support calls. And most of those errors were caused by user ignorance. We would usually try to explain to the user how to prevent the same problem from recurring in the future. Many people didn't even understand the most basic concepts or terminology needed to understand. And since so many problems were actually the result of several different actions (think randomly twisting all controls on an M4), it was generally a hopeless effort to try and give them a crash course in an arguably complex topic.
Sometimes we told people that their technical problems were caused by 'system errors' when we knew that an experience user would not have caused the same problem for themselves. Not often, but it happened sometimes. Mostly because we could not educate the users sufficiently in a short interaction to prevent future problems. And because no one wants to hear that they caused a problem, or that the tech support folks think that the user/customer is too slow to understand how to prevent it from happening again.
That said, if a repair vendor told me that my non-working airgun had a problem which I didn't cause by careless or ignorant action on my part, I would want to know what had happened and would press them for the info. It's helped me in the past when I am able to ask the repair shop some specific technical questions about the possible cause of a problem. That way they are much more likely to talk shop than to brush me off. Many (all?) of my airguns have failed in the past (several times) and I've ultimately been forced to disassemble and repair things myself. It's a learning experience but very irritating, especially when it's an expensive airgun, or maybe the only airgun of the type which I had at the time.