Why Double POV Is Forbidden ?

It says "multiple POVs are recommended". I think you read it wrong.

Not on a single video.

I was refused 1 run because of that and he took me away but double POV on two other speedruns.

It should be easy to edit the video and upload it as 2 separate videos then.

When we refer to "multiple POVs," we mean separate videos. Even then, only one POV is required, depending on the category. We want the videos not to be edited unless stated otherwise by a moderator.