I can only speculate, however it is possible that uchi saw that the domain was about to expire and saved the script and/or uchi used an archive of the website.

Ok so here's the story.

I originally created passphrase.io.

I sold the domain and license to use my script to devthedev. 

A few weeks before the domain expired, I warned dev on two separate occasions that he needed to renew. Once via email and once via PM. I even offered to buy it back from him, but he ignored.

He allowed the domain to expire, and I bought it back.