AFAIK, the speed increase to allow technology like the volume is the whole pitch. Not every studio has an entire volume, so lower-budget filmmakers can set up a system with a green screen where the cinematographer can see the CGI environment in real-time through the camera, and with the asset store integration, indie filmmakers can have an insane set/backdrop for a tiny fraction of the normal price.
Now that I think of it, though, I think Mr. Verbinski here is placing undue blame on UE5 when Marvel's CGI has been getting worse and worse because they throw an army of slaves at the footage after the fact, rather than paying artists and working with them to set up shots to make the CGI as easy as possible, like he did.
There was a bug recently fixed in Unity where if your system was already infected, a virus could run any code through Unity, possibly gaining privileges. I felt Unity slightly overstated the severity in their announcement to developers, but when you get an email from Unity saying "we fixed a critical engine vulnerability, update your game ASAP," it can be quite panic-inducing.