I always thought of 10x engineers as a specific type of engineer that follow the 10x rule, as detailed and discussed by Grant Cardone in his book `The 10x rule`. More on that book here: https://jamesclear.com/book-summaries/10x-rule

> The 10X Rule says that 1) you should set targets for yourself that are 10X greater than what you believe you can achieve and 2) you should take actions that are 10X greater than what you believe are necessary to achieve your goals. The biggest mistake most people make in life is not setting goals high enough. Taking massive action is the only way to fulfill your true potential.