Because when they relaunched (new publishers) they did it on the same page that has already been de-listed. Pretty sure they needed to do it with a new store listing, either that or they forgot something very important.

if the republish this steam wants 100$ for that and i dont think they would make the money back

You can't search for it because it has been delisted for many years. Some members of the community have gotten access to the source and have been able to bring it up. But this completely a community effort, there is no corporation, no publishers, just people who love the game. Anyway, you're posting here already so why do you need to search for it? =)

You can use the steam protocol to install the game by giving people this url: steam://rungameid/339280

Steam listing costs money https://store.steampowered.com/sub/163632

From everything they've said money doesn't enter into it, they don't have permission, and it seems unlikely to be given any time soon. But they have access to the source, and we can all contribute to spread news of the game, and give people the direct url to install the game.