And lo, there is verily even more information presented in the video than this thread has yet revealed. For what Alec says in the video is that this purge-the-cold-water advice is specific to North America, and he even explains the reasons why!
He does mention it has to do with voltage and heating systems. I think it's something he covered on his kettle vid.
Haha I have to admit I didn’t watch the whole video.
In which case my comment still stands for those who also haven’t watched the whole video, which is probably a fair amount of people