Following your steps, I got Atomic Blonde shrunk down from just under 60 GB to 26.3 GB on final product. MediaInfo recognizes that it is a Dolby Vision/HDR10 video. Now is the part that I think is my LG C9 TV being odd. When playing the video, it triggers HDR mode and not Dolby Vision mode (per the text that pops up when playing the video). Running the LG Dolby Vision 4K Demo video does trigger Dolby Vision Mode on my TV. On MediaInfo, it shows the demo video only having Dolby Vision under HDR Mode (nothing about HDR10 compatible being shown). I'm wondering if my TV is seeing the HDR info and choosing it instead of Dolby Vision (or is maybe activating both but only indicating HDR and giving me the HDR display modes instead of the DV display modes).
Outside of that "issue", this fits my current needs/wants on DV UHD movies.