No HDR because they couldn’t squeeze that out of Techniscope.
I don’t even care about watching in HDR personally, but if that was their explanation then that seems like a load of crap. Techniscope is still film and would benefit from higher color depth. I’m assuming they mean the 4K version will remain 8-bit SDR.
I was waiting for a 4K of this to happen because the HDR might make color correction easier. I guess we’ll just have to hope they fixed the missing color information as it is then.