I love his channel and comparisons but at the end of the day the tests are on a population of 1 and I guess accuracy can highly fluctuate between persons.

Also in some videos I remember he was using the Dreem headband as comparison standard.

I bought the Dreem 2 when it came out as it seemed like finally an accurate sleep tracker but the software and recording were very dubious: every night that didn't fit in a perfect sleeping pattern it failed to give any useful data. I ended up sending it back and wouldn't trust much the results after that.