Maybe but it could also be because they're using MetalFX Ultra in the videos and the 10 fps difference is normal at the highest quality at 4K. In the first
video I posted last Wednesday you can see there are four different settings: Performance, Balanced, Quality and Ultra. The difference between Ultra and Balanced is about 20 fps there.
Here is another comparison between MetalFX Temporal and Spatial with the same settings.
I wish there was a demo like Resident Evil 4 so we could test it ourselves.