Just because wingsuit flying is real doesn't mean the video is real
The lighting in the video is REALLY off. I call it fake too.
To my knowledge wingsuit flying isn't that fluid and fast
The reason it looks fake to your inexpert eyes is because the video is showcasing a new stabilization technology so your brains are expecting the video to be a shaky mess but instead you're watching an ultra-smooth video that's why it seems off to most of you.