I'm not a lawyer, and this is not legal advice, but I would think that it makes a huge difference whether the Workcover claim was genuine or not.
While it might breach your own workplace policies, simply advising/persuading someone to make a genuine claim is probably not illegal.
However, if an employee was bullied and effectively coerced into making a claim they didn't want to make, then the employer is almost certainly liable for allowing the bullying to occur.
I have no idea whether the employee would have a civil case against the person who bullied them and coerced them into making a compo claim.
If the claim was
not genuine or warranted, then it could get really messy, because it would probably be classed as fraud, which of course is a criminal offence.
I should stress that this is just my personal view of the situation you have described. It would be interesting to hear what others think, especially a lawyer