I think that’s missing the point he was making. No matter what front-end representation of a system you get, the implementation backing a no-code system will have edge cases around interactions both internally and with third-party systems. The fact that you’re hiding a system behind a veneer of “no code” doesn’t hide the fact that code is behind the actions that are taking place, it just means you can’t introspect it (even if this “no code” is in fact code).
I think a better point would be to make that that’s not a bad thing, sometimes abstractions provided in “no code” systems can greatly simplify a solution. But even the most well-designed solution will fail to some essential complexity of the root-problem the original authors didn’t understand. Without debugging tools (or privileged access to the backend of the implementing system) it’s difficult or impossible to understand what went wrong.