Denoise by render layers won't render HDRI

I tried composition setup for intel denoiser from video i found, works cool but there’s one but - it won’t render HDRI background, just black void, even with enabled transparency. How to turn background HDRI back?

I guess the background HDRI is not included in the channels that the video is comping together, so maybe at the end you need to put it all over a (probably separately denoised) copy of the whole image?