I can't seem to find what type of plane it is though.
The only thing I could find describes it as a "chase plane". I know one time they used Musk's private jet but I think that was an emergency replacement.
In the middle of the ocean It seems doubtful... I'm also intrigued by the angle - maybe a helicopter?
Plausible it could be launched from the landing platform prior to the attempt. Although, you'd think a drone could have a closer viewpoint. Anyway, very cool to see.