What is the age distribution of employees at Block? I'd guess it skews quite young. You won't have much natural attrition or interest in early retirement. And in this job market, voluntary severance is also not very attractive.
Young people love to be paid to switch jobs too - who would refuse 20 weeks of doubled income? From Squares perspective, this would lead to an adverse selection, because Square would lose the people who can easily get jobs elsewhere.
That is working on the assumption that those employees are meaningfully better than the ones who remain. If you have people you feel are under performers then yes, ideally you would lose those specifically but then it’s not a reorganization it’s a performance based layoff where you’re outright saying “you’re not good at your job”