You are right. I should have mentioned the Mac model too. It is a 2,3 GHz Quad-Core Intel Core i7 Macbook 13inch with 2,3 GHz Quad-Core Intel Core i7 processor.
I don’t intent to update yet (intentionally) unless I have to for various reasons. Please also note that the Napoleon trailer ( Trailer 1 1920×804 HEVC YUV422 10 bit DTS-HD Master Audio 5.1, AC3 5.1 MKV) plays fine which is at https://thedigitaltheater.com/napoleon-2023/ in case this is comparable. So, the only difference between the two files is the following:
Gran Turismo HEVC with YUV444 and
Napoleon HEVC with YUV422