I'll try to summarize: if we are not physically getting a new combination of RGB cone stimulation ratios in our retinas, then the colour gamut has not become "w

I'll try to summarize: if we are not physically getting a new combination of RGB cone stimulation ratios in our retinas, then the colour gamut has not become "wider". When compared to a SDR display, your HDR display that you mention above cannot display a RGB cone stimulation ratio that is not already achievable on the SDR display.