Thank you btw, I already knew it was an encoding issue but I was actually waiting for someone to confirm it. I turned off the VLC Hardware-accelerated decoding. The green artifacting is gone but the artifacting is still a problem, from the author's encoding.Yeah I never saw that either too. Check your video player's hardware acceleration, turning it off or on could fix the artifacting (Make sure to restart your video player afterwards!).
A message to everyone, that there is nothing wrong with your PC or Video Player. It's still the video.