Yes. I would never use or teach the technique being displayed in that video (not the least reason being I just don't have the required vertical reference skill for that). The pilots are obviously well practised with it, but as you say, such a nose down attitude if the load didn't release and got hooked up you'd be in a spot of bother. A vertical climb without any abrupt manoeuvring after releasing the load would only add about 20 seconds to the round trip time, and I think would be a much safer option.