Just tried the exiftool command and lightroom did apply the horizontal scale which should desquish an anamorphic photo. The resulting imported photo in Lightoom had a 2.4:1 ratio which is what it should have given a 3:2 image with a 1.6x Anamorphic lens. I tested on a regular image and the resulting file was stretched horizontally.
Iridient also respected the EXIF. DXO Photolab 6, Affinity and Photos did not.
I used Adobe DNG converter on the raw files and then ran
exiftool -DefaultScale="1.6 1" *.dng
in the file location of the DNGs.
I should be able to test with an anamorphic lens tomorrow.