This is mixing up a few different things. The hours for April are probably down because sales have cratered.
The new thing for payroll (as far as I understand) is that the forecast will be based on workload vs sales forecast. With the current system you gained additional payroll during the month (called flex payroll) if you exceeded sales. Now stores will gain flex payroll through higher than forecast workload such as fulfillment over forecast, checking out more guests at the front, RDC trucks being larger than average, etc. Most of us on here won't have a ton more details at the moment.