Burden of proof is much higher on a negative. Historically, every computing system devised has security vulnerabilities. And I didn't exactly claim the vulnerability had to be in the SM or Kernel.
(Also, I win by default, because the Tegra is a modern microprocessor and thus has speculative execution which is always vulnerable to a Spectre-class attack.)
It's all a matter of how many resources a few dozen (again, very talented) hacker / security researchers have and how easily exploited a vulnerability is for the average user. It doesn't look like the Switch 2 will have the same level of sophistication as the
Xbox One SoC in terms of mitigating hardware attacks at least.