ah I see! well, in that case imo no the guide is out of date, but tbh Nostr is very easy to get started with, just download Damus and create an account. Then, try to find Jack Dorsey. Look into his profile until you find the list of people he follows. Lastly, follow all the people you recognise. That's it, you're now on Nostr. Advanced topics include backing up your npub+nsec, connecting a lightning wallet using NWC, and zapping people.