I found the "well vetted" expense itemization to be non-reflective of my situation. I am (I think) middle class, though thanks to some crap in my recent past I had a significant issue with food/housing anxiety (very long painful story).
2100/month for a family of 3 for food. No. Not even close. If I bought the best of the best stuff from the high end grocer in my town (burbs between Ann Arbor and Detroit), I'd be hard pressed to break 1k/month for 3.
Car ... volvo? No. 1-3 year old used vehicles for me. And soon I am buying another one so I can give my daughter my 9 year old car.
Child care? She's in college now, so lets call that tuition and room/board. This works out to $30k/year in state. If I take an out of state offer, that shoots up to about $100k/year. We looked this up last night as it turns out. Tuition + room/board goes from $14k/semester to $46k/semester.
Most of the rest of the expenses are not relevant.
This all said, the point the article is making is fair and correct, maybe not quantitatively for everyone, but I'd argue the order of magnitude is correct. Some multiple of $100k is needed to raise a family in a middle class scenario while saving for retirement and servicing large debt.
One of the huge turnoffs for the left coast is the real estate issue. This forces me to ask for salary adjustments to make sure I am not impoverishing myself by taking a "better paying" job in CA. I've helped recruiters through the math, similar to this, in my last year job search. The cost of living delta, just from that aspect, was huge. I explained to them that they could leave me where I was, and not deal with that.
It is so bad right now, I could sell my $220k house, and not have enough money for a down payment on a modest similar sized house/property in a reasonable, not upscale, neighborhood in CA. Much less of an issue in NY area, though you have to deal with the traffic getting to/from the trains.
I understand the article was aimed at the left and right coast folks. And the numbers may be more accurate for young families there. For the rest of us in fly over country, this delta means that the larger salaries still generate an often (much) lower quality of life in those locations. It is far worse in CA than NY area. Definitely a disincentive to give those locations significant consideration without dealing with the massive delta in costs. Which most companies are loathe to do.