This doesn't make a lot of sense. If $100k gets you retired in 10 years, doubling your salary will probably get you there in 6-7. Seems odd to say that's not a significant improvement. Plus, as a practical matter, higher incomes frequently (but not always) come with having to live in a higher COL area. No amount of frugality is going to make a SF, Chicago, or NY cost the same as a Colorado.
That said, certainly do agree the permanent cuts in spending are actually more important because they work on both ends--increase savings and lower cash needs after retirement.