To be clear, I did not deny the original footage being 8K. However most people here are outside of China and do not have subscription account in Bilibili, so we can not see anything beyond 2K anywhere even though many people have device capable of 4K.
CMSE should NOT have relied on Bilibili's subscription based service to release the 8K footage. CMSE's information is NOT commercial for some company to make profit. CMSE is government agency like Foreign Ministry. People do not pay to hear the speech of FM speaker. That is why CCTV is there.
What CMSE can do is something like NASA does, upload the original onto one of their dedicated servers to make sure what CMSE is saying is not filtered by or dependent on Bilibili, Youtube or vimeo etc. Example is NASA photo archive, where full resolution photo in TIFF can be more than 300MB accompanied by JPEG of hundreds KB.
The key is for agency like CMSE being the ultimate authority and source of information. On this account, NASA is doing a much better job. And I have expected China to do even better due to the history of state's prominent position.