Basically, this is just the official statement from SU on where the situation stands. It is PR and is to confirm the findings that you can find from other YouTubers on this subject matter.
Particularly, SU has confirmed and verified this review. The reviewer also used a 2020 Denon 8K receiver in the test.
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Denon and Marantz are in a different (and more difficult) position than Yamaha because they have had the first 8K AV receivers on the market for 2020 for close to 6 months now. More liability..
There is not much new for those who have been following this issue...
Also as patwlkp said, these working scenarios are applicable only without HDR...