Qubes OS is a great solution for this threat model. By my (admittedly cursory) understanding of this attack, one would have to chain the attack to escalate to dom0 to get around it.

Having said that, fsflover exhibits a poor grasp of how this stuff works and all should be aware that even in Qubes OS, one would need to spawn new disposable VMs for each identity; relying on the Tor Browser's new identity creation within the same disposable VM would be little different from running Tor Browser on a traditional OS.