As long as you are just expecting math and not a generalizable strategy for retirement. The "simple math" behind Mr. Money Mustache is: Have no mortgage, multiple properties providing income, a blog providing income (including making recommendations of financial services that provide him affiliate income), and have nothing go wrong with your life financially or health-wise... and then you can retire with no[1] income! OK I'll get right on that...
Similar formula behind other get-wealthy motivational writers: Sell lots of books to people who gobble up get-wealthy motivational books, and collect royalties for life.
MMM is Personal Finance Porn: A story of one guy's very lucky and privileged life path, not generalizable to everyone else's situation even though it's sold as that.
[1] using a very flexible definition of "no"