While the article did a lot of pointing at men not working, it did little to show what the Hole in the "Hot U.S. Market" was. Maybe the people they were talking about would benefit from that information.
That's a really awesome job for someone who is struggling to make ends meet at a pizza joint (example from article). This is 100% anecdotal and regional. So take it with a grain of salt.
No shit, I was a data center manager then and contemplated switching jobs.
Source: I hired both union and non-union (union guys on the side) for electrical work in DC area data centers.
Given these are the types of jobs these men are leaving, and assuming these are the types of jobs still available, it's these jobs.
The market is hot because jobs are available. It's not hot because good jobs are available.
I personally had one hell of a time going through the hiring process despite my credentials.