The link mentioned in the OP points to: http://nhzcrypto.org/pages/next-horizon-development-roadmap/
But it is an invalid link, the correct link is: https://horizonplatform.io/about/development-roadmap/

Also the link in the OP to the Official Forum is: http://www.nhzcrypto.org
That Cloudflare website is offline, the one I find working is: https://horizonplatform.io/forums/

All other links in the OP are working ones.

Space to grow, thumbs up!