listen to the commentator who knew it was coming
here's a more detailed explanation "in the busstop chicane, Max had full steering lock to the left (check the onboard). Because of a netcode *glitch and tires locked into each other they ran off the track. Then Sven assumed Max did that on purpose; he obviously crashes into his Max and his teammate on purpose. Max saw this and also decided to crash into Sven on purpose."
*If the outside car pushes the inside car on the right rear quarter, neither car can turn, in iRacing.