I think it is very, very easy to read a blog post like that guys and immediately jump all over the guy. And, yes, there is a lot to jump on. And I do think he would be way better living a different lifestyle.
At the same time I think some of what he was saying has been misinterpreted. He makes the point that he doesn't have a lot of disposable income that isn't already committed. And, I suspect that is true.
Before DH retired and I ESR'ed we were in the over $250k range. And for a variety of reasons (some bad, some good) we had debt that we wanted to pay off. There were people who had much lower income who said that well, if they suddenly had our income, they could pay off $X debt in 6 months or whatever.
Well, that was true for them...but it wasn't true for us. That is, we had a lot of committed expenses that we just couldn't turn off immediately. We couldn't just decide to start paying half our mortgage or to not pay school tuition (we had a full year's contract) or to not buy the kind of clothes that were considered appropriate for my work environment, etc.
Now, we did unwind all of that. We paid off the debt we had and over a period of about 4 years were able to reduce most of those committed expenses. But, we couldn't do it immediately.
What I found was that we were very, very good on the small things. I always read these articles about how to reduce expenses. Don't go to Starbucks every day (we didn't) and so on. Generally we didn't do any of that. The big drain was the big expenses -- mortgage, cars, vacation, school tuition and so on. And those types of expenses tend to (1) not be things you can turn off immediately and (2) changing them is a huge lifestyle change.
I'm glad we changed most of those things (some of them our kids aged out of them). But doing it was a lot more time consuming than many might realize.