I now see the captions, which appear selectively at various points during the video. Everything runs at normal speed.
By the way, has anybody tried clicking on the CC button and selecting the “English (Automatic Captions)” option? The results are hilarious. I’ve just watched the first 60 seconds of the video in that mode, and in that brief time I’ve already come across such howlers as “cliffside Parker”, “Axis and Allies 1948 Global”, “they stray for rolling in” and – my favourite one so far – “it was designed by embezzle”. Can’t wait to watch the rest of it during my lunch break!