This is incredibly bad advice. If you want to achieve a great career, you need to "move up". This is one way to slightly increase the chance of not getting fire

This is incredibly bad advice. If you want to achieve a great career, you need to "move up". This is one way to slightly increase the chance of not getting fired, at the cost of a guarantee you won't be moving up ... If you have zero ambition ... perhaps. If you want to have a great career, you absolutely want to avoid this way. And frankly, even if you have zero ambition at work, still a very dangerous game to play. Management might choose to force the issue by firing you JUST because you have a moat, forcing the org to build the knowledge that way. And, since we're talking about 20-30 year timeframes here, things go obsolete.