It did reliably generate numbers that produced zero google search results. Maybe that's what they meant?

Though it did also occasionally spit out a "number" with a letter in it, like "q29199.951301068788".

I just laughed for a full thirty seconds.

What's most interesting about that is somebody actually bothered to put it together.

The logic for that generator is particularly basic: https://thisnumberdoesnotexist.com/js/main.js