This was after he won gold at the World Championships in Stuttgart in 1986. IIRC the t-shirt he unveiled for the lap of honour read - in German - “Germany’s 3 most loved sons - Boris, Bernhard, and Daley”. I’ve not seen the documentary but have to admit that he came across as a bit of a knob at times down the years. However, that t-shirt was pure box office and showed he had a likeable humorous side! I seem to recall that despite him beating Hingsen on that occasion, Daley got a good reception from the German crowd.