This is just Amazon's "Working Backwards" methodology [1] expressed simplistically. There's also a book about written by key Amazon people. [2]

A core part of the Working Backwards idea is to start out by writing a fake press release, even for internal projects. This helps crystallize exactly what is important and what isn't, as it forces you to express your goal precisely and succinctly as well as define what it brings to the table.

[1] https://youtu.be/aFdpBqmDpzM?si=NFM9N62VpWmRi8Jp

[2] https://www.amazon.com/Working-Backwards-Insights-Stories-Se...