[judge2020]

None of your points are untrue, but "engineers that are already fairly well compensated" is exactly who OP and the article are referring to:

> Read any publication that cares about business, from the NYT to the Wall Street Journal, and you’ll see a ton of hand wringing about The Quittening, and the accompanying talent shortage.

These publications aren't talking about the workforce in general, they're pseudo-gossip articles about the wealthy top engineers and how well-off they are that they can focus on things other than how much they put into savings each paycheck.