It is still considered Dynamic Tone Mapping because it is dynamically changing its tone mapping based on the attributes of each scene and/or frame, metadata or not.
Also, many people mistakenly think Dolby Vision is only scene by scene. This is not the case. If you read a bunch of the DV literature and white papers, you will see mention of frame by frame numerous times. I believe it is based on who masters the project and what they decide to use as far as metadata creation.
I have not tried this since it has been quite awhile since I have had an Epson projector using my original HarperVision techniques.
Knowing what I know about both processes though, I think it is best to use the HDR mode on your Epson if you're going to use this LLDV tweak on it. My original HarperVision I created for the Epson 5040UB/9300 was to fix a known issue for the time, that being a too dull, dark and lifeless image when HDR was first introduced, especially on projectors. Since the advent of custom curves, dynamic tone mapping and the prevalence of Dolby Vision now, the original settings are no longer the best option in my opinion.
I would try both though and choose which you prefer.
I have been using the "HarperVision" name for my custom video mods, tweaks and procedures for quite awhile now. Back in about 2016 if I recall, I used that moniker to describe a procedure I initially used on the Epson 5040UB/9300 to rectify the dark HDR imaging which was seen when using the standard HDR mode on these and other projectors. See my description above to jordanfff.
I then further created similar settings for projectors like the Epson LS10000, which didn't accept a native HDR video input but it did use laser phosphor with a DCI-P3 color filter, so it made this projector able to accept and display HDR amazingly well, when also combined with an HDFury device, similar to what we do here now.
If I hadn't figured these things out in the first place, I don't think I ever would have discovered this new LLDV mod, so we need to give credit to this prior work for what we have now with this new version of "
HarperVision LLDV"!