The blog post isn't directed at 10-year-olds. In fact, you're pulling a phrase from a paragraph that's describing exactly how you should not speak when talking to a 10-year-old.

> The simplest constraint for anyone trying to explain a complex topic is to accept the request to “explain it to me like I’m 10 years old”. What’s packed into that request is, vividly exaggerated, the reminder that what seems obvious to an expert is often incomprehensible to the listener. Technical jargon and fusillades of acronyms are often used to convey an explanation that has been denuded of all the foundations and context that might allow it to make sense.

It's when multiple soldiers are ordered to fire their guns very quickly, either everyone at once or one after another.

Indeed, TFA isn’t exactly pellucid

I don't think the article itself was intended to be written for a 10-year-old to understand it.