Those slides were before TAA upsampling was added, but the issues are similar once it is in place too. Unreal Engine already has TAA upsampling, but has to fight against the issues mentioned in the Nvidia presentation.
Nvidia trained it for specific upsampling multiples, so the main functional difference with existing TAA upsampling is it can't do continuous base-resolution changes.
You can look at the tradeoffs of neighborhood clamping/clipping here:
https://de45xmedrsdbp.cloudfront.net/Resources/files/Tempora...
Those slides were before TAA upsampling was added, but the issues are similar once it is in place too. Unreal Engine already has TAA upsampling, but has to fight against the issues mentioned in the Nvidia presentation.
Nvidia trained it for specific upsampling multiples, so the main functional difference with existing TAA upsampling is it can't do continuous base-resolution changes.