Seth Godin on freelancing rates

Does #SethGodin's advice for freelancers to charge 2.5x what they'd expect to make in full-time employment still make for good maths?

It's ten years old as a blogpost, but I still see references to it.

I'm interested in what people think, does the algorithm still work for 2024?

https://seths.blog/2015/03/double-and-half-freelancer-math/