Well is that really true, for v1 switch yes Nvidia was to blame. But then how do you explain migswitch - is that nvidia's fault or picofly on patched switches - is that also nvidia's fault?
Look at evey console - some said xbox360 couldn't be hacked without a hardware mod and we have bad update/bad avatar. PS3 was hacked via usb, PS4 via web browser (and others). Every console has been hacked. Someone ends up just thinking about some way to defeat the system, switch 2 can probably be done by removing the chips from the motherboard, putting on a custom board to read them, or decapping them and then decompiling/decrypting firmware and then looking for an exploit.
While it's true most people don't have the resources or knowledge to do that, there's people in this world that do.....so is switch 2 unhackable? I don't think so and history has shown us that everything is hackable at some point. Now we have AI tools that can be used to help with this, so it's just a matter of time until it's hacked in my opinion. For all we know someone could have a custom game cartridge mod that's not public.