The FCTM is normally customized for your airline so I guess it's normal to see some differences in the procedure. Our FCTM clearly states exactly as Vilas explained above except that the CM1 will normally talk to ATC after evacuation is initiated. But of course he can delegate this task to the CM2.
I joined below an extract from our SOPM for the rejected take off procedure.
https://ibb.co/du9PS7
Edit: Sorry FlightDetent, I realise now it does not answer your question.. Lol.
Maybe if the situation is really critical they assume it should be the captain duty to talk to ATC? Just a guess. I'm confused too reading your FCTM extract. xD