No. Changing your identity is much more powerful and sort of operates in a background process whereas willpower is more of a conscious foreground one and very difficult to sustain long term.

Read the book. It goes into some detail.

I’ve worked with thousands of people personally over the years to help them with supposedly difficult to treat addictions for instance. Willpower is fine to start, but completely fails in the long term. Identity change is the only thing I’ve found that works long term.