Do the people who issue GRC actually claim that their patients (? I don't know if that's the correct word) present no risk? I thought they just diagnosed gender dysphoria.
No, they just certify that they have GD. A serial killer could have GD. The TRAs accuse us of relying on false stereotypes in our arguments. However, they do the same. Trans women are presented as harmless but tortured souls, meaning that if someone has GD, people almost immediately stop questioning whether they could pose a risk. The reality is that TW, like all other male people, are not a homogenous group. Some will be no risk but some will be a risk. You really cannot tell just through a GD diagnosis.
One advantage is that individuals with GD are much more likely to be on hormones and to have had surgery.