TL;DW: At 4K, the RTX 5090 hits 20-50% uplifts in raster as compared to the RTX 4090, and 27-35% uplifts in RT as compared to the RTX 4090. Power efficiency is roughly equivalent to the 4090. The new dual flowthrough cooler design seems to perform exactly as advertised, providing remarkable cooling for a card that is only two slots thick.
He has explicitly stated that the main GN channel will have no more drama. It goes to the website or the consumer advocacy channel. He and his team are still doing reviews and other contentt that is well worth watching if you care about the topic.