> Assuming both people are truthful and operating in good faith, how can this be explained?

Quite simply, difference in skill.

The sysadmin that has configured a few applications in their career would likely get annoyed at how many mistakes an LLM makes.

The manager who barely knows their way around a shell, uses an LLM to configure an application in less than the three business days it will take them, and will claim they are 10x more productive now.

Once again, LLMs are effectively great at triggering the Dunning-Kruger effect. The least you know, the more productive you feel.