Mostly I agree, but I think this statement carries with it an oversimplification of the world.

In practice, some of what it takes to do a given thing comes from thing-specific information (which is appropriate to ask questions about), and some comes from a background of experience in doing/studying other similar things (formally or informally). For complicated tasks it basically has to be this way, because there just isn't time to train a person up from scratch for each task -- a random person off the street could not perform surgery merely by first asking a sufficient number of questions about exactly how to do it. People find "stupid questions" alarming because they reveal holes in this important second category, and make people wonder what else important might be missing.

You could make the argument that it's better for society if everyone asks whatever "stupid" question comes to mind, because then incompetent people and charlatans will be quickly exposed and the harm they would do minimised. But it's not good for the charlatan!

I don't side with actual charlatans, of course, but most of the time I do side with people of imperfect competence, because that's most of us. Competence is improved by practice, and most tasks are low-stakes. If a person is already near the threshold of being perceived as unacceptably incompetent by others, and can discover the information they need via other means than by asking "stupid questions", that may well be the best way for everyone.

That's not to say that I advocate never asking stupid questions. In fact I would encourage people to lean more in that direction as a default setting -- they are the fastest way to get the necessary information. They just have a cost that it would be naive to ignore. It's a judgement call, is all I'm saying.