Yes, I contacted ClearTouch and obtained the latest firmware update (October 2026), but when installed on all my RL500s, it still reports NDI HX2. But I found this to be an updateable text field, and likely does not reflect that the camera supports HX3.
I cannot determine if it actually supports HX3. however, in my experience, the latest version does seem to address latency quite well, to under what I can discern visually. Wish I had a more scientific answer for you.