Yes, not finished reading it yet. But it certainly aligns with Mr. Money Mustache's core philosophies.
While many people spend money to do things that give you short term pleasure (or at least, distraction), learning to do things for yourself, modeling your life around personal growth and worthwhile pursuits is going to result in much more happiness.
Now perhaps "suffering" through the working years to retire early is not a life filled with autotelic experiences, so in that respect, we can add something to the Mustachian way by learning how to better appreciate our careers before we reach FIRE, which I think a lot of people reading the site and participating in the forums really need. MMM has already reached FIRE, and the newer articles are often more geared towards how to live his life as it is, with less focus on the process of getting there. (We see this with popular blog authors, just as J.D. lost popularity as he graduated beyond the process and sold the blog.)