The Dolby Vision feature for Halo Infinite received a significant improvement after the mid-season update.
The current mid-season update for Halo Infinite not only corrected some bugs in the shooter. The Master Chief now looks better in Dolby Vision too.
As noted by HDTVTest’s EvilBoris, the Dolby Vision output has been fixed in Halo Infinite. So he sees around 1000 nits of data being sent to his LG C9 (Cinema mode).
As a result, Dolby Vision for Halo Infinite has been greatly improved and can be used again.
You can take a look at the patch notes for the mid-season update here.