> got it but when will it be implemented by kdenlive? any dev here?

I hate to be that person but https://kdenlive.org/en/developers-welcome/

This is research work. I don't suspect anyone currently has any plans to implement something like this into kdenlive.

It looks like the paper and code for both the original NeRF and this new Localrf method are free and open source, so that bodes well for integration into Kdenlive. In any case, I'm available for contracts ;)