If a user used Cloudflare Warp to access your website, Cloudflare used to put the real user’s IP in the cf-connecting-ip header (we can even see a post about it here: WARP exposing client's IP to websites behind Cloudflare?).
Now I don’t think they do that. The IP in the header is the VPN’s IP address instead of the user’s IP. Can anyone reproduce this? Why have they suddenly changed this without telling anyone?
Please discuss this in the thread where you already posted, as it would be off-topic for the thread here. The OP asked why the address is not visible any more and that’s explained by the article.