They made an Elden Ring long covid mod: https://www.nexusmods.com/eldenring/mods/3481
They also made a The Witcher 3 long covid mod: https://www.nexusmods.com/users/30242600
They're working on on a Minecraft long covid mod @Bruja points out that the Minecraft long covid mod is complete, also
Archive of the deleted tweet: https://archive.is/3MgHj
The minecraft long covid mod
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is already on their page, actually, with no description of what it does:https://longcovideurope.org/wp-content/uploads/2023/05/Long-COVID-Mode_Minecraft.zip
They say it'll go up on CurseForge with a description. The ones for the other two mods probably give an idea what to expect. Haven't tested this, don't know if it's limited to java or bedrock or anything.
The zip contains a PDF that describes it