What you are describing has typically been called "the shakedown" by management at companies for which I have worked when the employee shows up with competing offers. When the employee shows up and resigns, it's called a "dive and catch." These are perceived very differently by the people involved even though the basics are the same except for the trappings.
What I find interesting about the article is that an average time-in-place below about two years and absent a few longer stints basically takes a normal-ish resume and turns those short gigs into red flags
The really short work time thing shows lots of potential issues. Employee has never "shipped" and lived with the consequences. Employee flees after making a mess, either personal or professional. Employee has a problem with chasing the new shiny. Employee makes terrible decisions about fit and chooses gigs that aren't a fit for bad, ephemeral, etc. reasons and then when those cease to apply (financial stress alleviated, no longer a dog friendly office, etc.) employee bails. Another variant of poor fit is maybe employee tends toward emotion (desperation - I NEED A JOB NOW) and takes something they never would have taken otherwise. Maybe employee picks fights with other employees. Employee doesn't know how to bond ... the list goes on. Even simple pattern matching: The people everyone has known who are frequent short-time-in-place hoppers tend to be flakes so maybe employee is just a flake.
Someone below has a pretty good comment - "You get about 30 years to make as much money as possible and that's it." At least in technology, that is very true; less so in medicine or dentistry for example, and naturally capital doesn't really benefit from employees understanding that. It's so much more obvious to me 20Y in how true that is.
One thing I think is interesting: the average genXer that I know has never, ever thought strategically about their career and has spent the last 15-20y assuming things would follow a sort of generic life sequence; the sort of "a career is something that happens along the way" mindset. In contrast, while I personally may not like the stereotypical millennial aspirational trappings, at least some of them are viewing career as something they should be piloting instead of being along for the ride; not just waiting for a layoff or firing. At least they give the appearance of being better about it. But then again, so much of their appearances are curated fictions so who can tell.