This isn't something anyone should call a review nor is there anything useful to be had. Every single game is running FSR, resolution scaling and/or Frame Generation. Frame Generation at such low frame rates is just a bad experience which might look good in video, but sure won't when you're hands on. The artifacting introduced when using FSR at 1080p is generally going to be worse than just running 720p unless your display has an awful scaler since FSR is scaling from lower than 720p resolution. Then there's the fact that there was no comparison to a similar system using the 780m.
All in all this is more like an advertisement for a product than anything useful. I have no doubt the 890m is better than 780m because AMD wouldn't have added CUs if they weren't getting anything out of it. However who knows how much of a real world improvement there is as we still don't know.
ETA prime doesn't do reviews, it's pretty well known. He does more of an early glimpse of the product with some gaming tests thrown in.
But I disagree with the usefulness of the videos. They are, in fact, very useful. You get to see if there's any SSD/RAM upgrade options, and how well it performs if you tune the game settings.
You know what's worse than FSR and frame gen at low fps? low fps at resolutions you can't read the text anyways.
And yes, that includes 720p. Games these days don't offer a font size that is legible at 720p.