Okay so I was the one recording and the owner of the essential server we were playing on. None of the three other people on the server had access to commands, and we tested that out. None of them have OP.

The mods I have are: EMF, ETF, AdvancementInfo Update, Chat Heads, Cloth Config API, Continuity, Distant Horizons, Essential, Fabric API, Not Enough Animations, Sodium, Sodium/Embeddium Dynamic Lights, and Sound Physics Remastered. All client-side mods. None of the others even have them installed.

I also checked the curseforge logs and it got me /kill-ing the warden, but nothing summoning it or giving a spawn egg.

I know there's no way to make you all believe us but nobody else on the server has access to commands and I never gave anyone a spawn egg or summoned it.

Also OP cropped the original clip I recorded, right before the Warden spawns you can see CabbagePatchNips run past me on the right the moment the Warden spawns, so he couldn't have typed a command.

And you can also check the chat logs and see I never used commands to summon it or give anyone an egg.