TheParkanyi

What I suspected at first was a kind of signal redundancy, as he used the internal DP injection port, despite the back I/O has a separate one, but your idea seems more legit

The solution Linus is talking about (considering it is a cable of some length and uses Thunderbolt 3) is likely the upcoming Corning Optical Thunderbolt 3 cables that are supposed to come out soon-ish (The manufacturer in the link is Sonnet, but the cables are likely based on Corning tech). They propose the ability to send Thunderbolt 3 signals to a run of around 50 meters (~146 ft) or more. So while Linus cannot talk about it openly yet, they have been announced. It's just a matter of when. 

https://appleinsider.com/articles/19/09/11/long-optical-thunderbolt-3-cables-are-coming-soon

I hope, there'll be an update video, where they test these machines. I don't really know, why some of these sellers think, that a person willing to spend half of it's monthly income don't have the right to know what components of the PC. Also, I don't understand, why companies think, making a fool of a person ("buy a Z390 boars, 'cause it's faster" or "buy a 120GB SSD it'll be enough"... GTA V is more than 70GB alone, for f*cks sake!!!!) is a good marketing plan... I was disappointed seeing my home countries' (Hungary FYI) system builders companies recommendations, but this is madness...
 
Look at this for example. OK, it's shipped with a B360 mobo, but you can call them to upgrade, and it'll be still under 2000 CAD (the price you see at the bottom is after a 25% VAT)
 

Since a few people have already asked:
 
Yes. There will be follow-ups to this video with regards to the build/specs/value/and more customer support fun.