"Those retirement benefits are practically unheard of in the private sector." They forgot to add ... these days.
That's true. The utility that I started my Engineering career at ended pensions in the late 1980's and went over to 401K's and employer matching contributions.
But even with the old pension system - if you retired early, you gave up quite a bit of retirement pay for the privilege. And when you did retire, it was at a fraction of your full time pay - somewhere around 50 percent as I recall.