Mr Corbyn can say these things, along with things like 'Labour will be the next government ...', and 'I am going to be a good leader for the country ...' and 'Mickey Mouse comes to my house for tea every Sunday ...'.
They are all equally fanciful, they all fall down under the slightest scrutiny, but most important of all, Mr Corbyn knows there is not the remotest chance of ever being called upon to act on any of them, or prove them as even vaguely realistic.
Let's face it, with proposed Senior Cabinet members like Diane Abbot, a woman who manages the difficult feat of simultaneously talking as though English is not her first language, while also sounding as though she has just pulled herself together after sobbing hysterically for about an hour - Mr Corbyn is in no danger of troubling any government in this millennium.