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Sounds a lot like early spaced repetition effects (supermemo/anki) but without the extended repetitions?

More like cramming before the exam in this case. Though, one can use rewatching as a spaced repetition session. The key would be to actively try to remember the narrative of the lecture. Otherwise, passive rewatching wouldn't help as much.

Given this huge caveat, the title of the article is at best extremely deceiving. It's bonkers to me that this was the comparison they chose (watched at 1x speed -> 1 week delay -> test) vs (watched at 2x speed -> 1 week delay -> watched 2x speed -> test). Full description of this is found on page 7 at https://www.researchgate.net/publication/356194270_Learning_...

Another thing: what were the scores? If the 2x watchers got a 70 instead of a 50 does that really help? In college I was trying to get As not Cs

What about watching a video at 1x twice