At least hidden profiles would be good enough for basic protection.
They have this which wipes your device, but you can get killed under duress. https://discuss.grapheneos.org/d/14722-using-duress-password...
If the only thing protecting you from getting shot to death is a bulletproof vest, clearly a lot has already gone very wrong, and you're likely to die today anyway. But that kind of thinking is exactly what leads to a failure to defend in depth.