The link you give above leads to this sign up page:
There is a different invitation link on reddit that leads to this one:
Are either of these Discord server âofficialâ in that they were created by the development people of krita?
(Hello @Michelist 
)
This answers your question, too, @AhabGreybeard:
This server is known in the forum, I think it was even founded by a forum member, but it is not in any way official server recommended, operated or managed by Krita Foundation.
Maybe this server is a little more respectful.
By the way @Thang_Tran, the server you linked to was even called toxic here in the forumâŚ
Oops, seems discord servers named âKrita discord serverâ, and the like, seem to grow up like mushrooms after a warm October-Rain. I meant a different discord-server created as it was in the name of Krita.
Michelist
Add: Hello @AhabGreybeard 
Yes, @Rakurriâs server doesnât claim to be âKritaâ and doesnât use the logo 
And it is not used for Krita-Bashing, as far as I know!
Michelist
Krita doesnât have an official discord server and probably never have one. Please specify that it is the unofficial discord server as discord can be too heated place sometimes and action of the moderators or the members may harm the projectâs reputation.
This is a small sever where some artist can chat or somthingâŚ
That is nice, but please put it in the description that this is not official Krita discord server. Right now it seems like an official one.
That name is misleading - people are going to think that is literally âKritaâs discord.â
Also, the title of this post has been changed just now so people are not led to think Krita supports it.
An hour ago, I asked it there to add such information, but more than an âoh okâ hasnât happened in the meantime. 
Michelist