Showing a block page once was Pi-hole's default behaviour, but you'd never see such a page when browsing the web nowadays: As pointed out repeatedly, redirecting to a block page generally does not work as soon as HTTPS is involved.
Due to the increasing adoption of HTTPS (>95% in Europe, North America and Oceania, >80% in Africa, Asia and South America), Pi-hole has switched its default behavior to NULL blocking as early as 2018 with Pi-hole v4.0 , so that the block page was no longer used by default, and the block page itself was removed from Pi-hole in 2022.
It won't return.