We're getting into the semantics of what "SDR" means. In this context it does not equate to 1080p Blu-ray which is what many think "SDR" is. What I'm saying is that tonemapped HDR is not the same as what you get from 1080p blu-ray. That's why I said madVR and Lumagen output tonemapped HDR content in an SDR "container". This is done so that the display uses gamma (2.2 or 2.4 or whatever you tell it your display is calibrate to) to match how the tonemapper is rendering the content. But what you get can still be HDR despite using a gamma based display solution. Both tonemappers give you the option to tonemap to HDR10's PQ/EOTF standard if that's what you want to use as the container instead. The only point is that SDR in this context does not equate to what you get from older SDR content found on 1080p Blu-ray.Maybe the JVC DTM output is not SDR, but some DTM is.
madVR DTM output is certainly SDR with a linear gamma of 2.2.
That's what HDR is all about, gamma.
Wide color gamut or bit depth has nothing to do with HDR or SDR. You can certainly have an SDR video with BT2020 color and 12-bit depth, but if it's graded to a linear 2.2 gamma, it's not high dynamic range in any sense of the term.
Just because the result of JVC DTM looks more "HDR", doesn't mean it's an HDR format or picture.
What if you captured the signal coming from the JVC DTM, and played it back on a Sony display?
For example you can do this with HTPC madVR. You could 100% record the madVR DTM output and store it in an SDR-only video container, and play it back through a display chain and on a display that only supports SDR. It is SDR, but that doesn't mean it can't look better than the studio's SDR conversation for instance. But that doesn't mean its HDR.
The Lumagen Radiance Pro uses very similar terminology to describe how their tonemapper works:
A key concept to understand for HDR sources and HDR Tone Mapping is that data manipulation in the pipeline does not always have to be in “HDR Gamma.” Just as DCI/P3 movies are put into a “Rec 2020 container” for HDR, it is possible to put the HDR Gamma into a “SDR container” if this is accounted for so that the onscreen image is correct. This is not somehow converting HDR to SDR. Instead it is putting the “HDR in an SDR container.