There's a lot of great insight in there, but he's talking about senior executives, not technical contributors. From the article:

if you manage a junior employee and they ask you about their career development, you can say what comes naturally and generally get away with it. As we saw above, things change when you deal with highly ambitious, seasoned professionals.

I've worked with Ben and I know that if a highly-valued technical contributor turned in a resignation he would make a counter-offer to keep them.