Weird flickering in my model when I rotate the camera and even if it's fixed I was working on this model and everything was going fine. After I finished making the hands I took a look at the full model and noticed this weird flickering. Naturally I tried merging by distance and recalculating the normals, but nothing changed, the flickering continued when I switched render engines.
I tried re-opening Blender and restarting my computer but the problem continued.
Here's video: Weird flickering in Blender 2.83
What troubles me the most is that it wasn't happening earlier today, I clearly made a mistake or pushed a wrong button in the process of modeling, but I have no idea what exactly.
EDIT: Google-Drive Blend File
This is likely because your mirror modifier is copying and mirroring each side independently without culling one side. Check you mirror modifier options and check bisect then check or un-check flip to choose which side to delete and which side to mirror.

Probably what you did was apply the mirror modifier at some point.