[ljm]

Depends on the laws in your country. In the UK for example, if you make a position redundant and then immediately rehire for it, the laid off employee can take you to an employment tribunal for unfair dismissal, as the redundancy wasn’t genuine.

Given that redundancy is a more complicated legal process it’s unlikely you’d use it for this purpose.

[orra]

P&O famously fired a lot of people in the UK, a year ago, and immediately replaced them with agency staff.

This was widely considered to be fire and rehire, although the government position was that it was “just fire”. So companies are willing to skirt the intention of the law.