That’s correct, I started using that in the first edit version of this image but then Aurélien announced the release of filmic V4 that bundles a highlights “reconstruct” feature, that aims to do the same as the low-pass method, so I used it in the end.
I’m not sure it it will make the next darktable 3.2 release, but it’s already in dev master branch.
EDIT:
I don’t think it did, since it restrains its effect to very bright areas of the image. I think the edit is very good and I’m referring to the overall image 