Do they really need (or care) to know the underlying architecture? Typically the non technical audiences I've worked with care more about how it solves their problems, how much it costs, who responds when something goes down (and how long it takes), what your pros and cons are compared to the competitors, etc. They typically glaze over at the architecture part or take a picture of it and send it to the devs afterward…
The problem is that the non-technical people are working as architects.
What do you mean?