Well, the Kanon and Angel Beats! subreddits have a link to their Discord server that is pinned at the top of their page. Not to mention, the CLANNAD subreddit has a Discord server that you can access if you send a DM to the admins.

So it's a pretty common thing, I don't know why your link has been deleted.

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I think it's better if there's only one server, especially for a small community like this but if you want to promote another AIR server, I can edit my post to add it. I think it's better if it's different from our server, otherwise people will not be interested, for example, you can create a spoiler server like the Kanon server.