Scraping through a website at the scale they are talking about isn’t really viable. You need access to the API so that you can have very targeted requests.
This is why reddit changed their API pricing and screwed over everyone using third party apps. They can make more money selling access to LLM trainers than they could from having millions of people using apps that rely on the API.
From the Australian fair work ombudsmen:
When overpayments occur, the employer and employee should discuss and agree on a repayment arrangement.
If the employee agrees to repay the money, a written agreement should be made which sets out the:
reason for the overpayment
amount of money overpaid
way repayments will be made (for example, cash, cheque or electronic transfer) and how often (this has to be reasonable).
Granted, this is generally for overpayment of wages and not specific to redundancy pay. There may be clauses in their contracts with varying terms that allow them to reclaim, but I’m just some dude on the internet.