I agree with what Mike said. We shared the content because we want people to read the book and to use interviewing.io... it's not because we've given up on it (see my longer comment about it: https://news.ycombinator.com/item?id=44136448). We have yet to see any real evidence that technical interviews are dying.

What is hopefully dying is companies asking verbatim LeetCode questions and candidates having to memorize a bunch of questions. We wrote this book largely because we wanted to teach people how to think. I knowing how to think is only going to get more valuable.