April Fools Joke. On 1 April.
According to Jared Polin Youtube website
{ Sony Announces A7 IV !!! Nikon Reveals Pro Mirrorless, Cancels D6 ! }
Nikon has dropped production of the D6 which was recently announced.
It is a spoof.
So far cannot find any official Nikon press release.
In view of Covid-19 deaths and 200,000+ infected, many in US have refrained from April Fools pranks and jokes.
Not sure why Jared Polin decided to go ahead with this video episode.