Total, absolute garbage!
How can you separate out all those costs for each kid? Once we had one kid, our health insurance was family, didn't add an extra multiplier for each one. Didn't go out and buy another car with each new baby; took whole family on necessary trips, not individual trips. They wore hand me downs, we had tons of lightly worn baby/kid clothes. No childcare - I was SAHM. Didn't upgrade to a bigger house (ok, started out in a big farmhouse) with each kid.
Honestly, our spending was roughly $25k/yr for all 5 kids, plus DH and me! It's still pretty similar now with only DS5 left at home - property and school taxes are the same regardless, utilities similar, auto expenses similar, etc. Food is probably the biggest change, but still not that huge. There's economies of scale with a bunch of kids.