Basically the monitor cable is hard wired into the stand and passes through a hole in the table top right under the monitor stand
Then it goes through the tube legs of the table and sneak into the case from the front (the part we can't see)
Then everything is soldered onto the motherboard directly
Now if you look closely she is using invisible keyboard and mouse with invisible wires so problem solved but the most tricky part is the power cord
For that there is a outlet on the floor right under the tower and it is once again soldered directly in the PSU
This kind of creativity is beyond impressive , it is mind boggling