You assume the intent of the video was to be listened to and accepted as actual input.

My assumption is roughly the opposite - the intent of the video was to prejudice the jury as far as possible against the accused (he killed a person honorable enough and empathetic enough to suggest a more lenient sentence! To the pit with him!)

It wasn't about the content of the video - it was about the emotional response to an AI generated facsimile of the victim.