Re: HiFi separates equivalent
The first DVB-T2 broadcast demo was at IBC in 2008; that's a decade after the launch of DVB-T in the UK, and it was a couple of years before there was actually a service launch, so it was hardly straight after.
And there's no special HDR version of DVB-T2; it's a transmission system, and you can stuff any sort of picture you like down it, whether using MPEG2, H.264 or HEVC. So, you could quite easily use it for a profile of HEVC that includes HDR or an extended gamut.
As for the 2008 Mac, as I said, updates are available for it. The only reason I've not installed them is because while free, I will probably then have to spend money on updating other software to newer versions.