This is no great secret or revelation, Amazon's recruiters literally coach every candidate to use the STAR method.

And many interviewers will again repeat the advice/request to answer in STAR format.

From the second paragraph on, it reads like a copy paste of one of the docs Amazon recruiters email out ahead of the interview.

In Every amazon position, you will see the star method being mentioned

Yes, that's literally what the interviewers are asking for. Congratulations.