See section 10.4 of the NMC CoP also section 10 of the guidance from the NMC on fitness to practise
Being struck off is a sanction for misconduct, and a RoRA conviction would be misconduct. Jumping from that to saying that someone
will be struck off for short-faring is a step too far.
The NMC
may choose to sanction someone for short-faring, and they
may choose to impose the maximum sanction, but none of that is inevitable.
When deciding as to someone's fitness to practice the NMC will usually take into account the severity of the offence, the professional insight of the nurse, the remorse (or otherwise) of the nurse, the transparency of their declarations and any other relevant factors.
I would be astounded if the NMC decided to strike someone off for this unless they have a history of serious professional misconduct.
Where I've worked on fitness for practice cases (with student nurses) I've only seen them be found unfit where they have shown no professional insight or remorse, they have lied or the behaviour has been extremely serious and involved physical or verbal abuse or an abuse of trust.