That’s not how the throwaway reservations worked.
Before this change, people would book a throwaway campsite for one night. They would get free theme park parking for “arrival” and “departure” days (essentially 2 consecutive days). They would get MBs for everyone on the reservation and everyone on the reservation would have access to EMH if one fell one the “arrival” or “departure” day. None of that is changing. What has changed is that they got a roiling 60-day window for FPs following that reservation night. IOW, they could book FPs for Days #1 and #2 at 60 days prior to arrival and then at 58 days prior to arrival, they could book for Day #3’ and the at 57 days prior to arrival, they could book Day #4, and so forth. Now, they get a 60-day FP window that opens on arrival day and closes on departure day. Any subsequent days will need to be booked at 30 days prior to that day.
The every-other-day (EOD) reservations do not give them a 60-day+ FP booking advantage for all of their nights because they are not continuous. Each night reserved is a separate 60-day booking window. What EOD does is give them EMH, free theme park parking for 2 days for each night reserved and a rolling 60-day FP window. So in the MWF example, when the 60-day window opens for Monday, the guest could get FPs for Monday and Tuesday. But they would have to wait until the 60-day window opens for Wednesday in order to get GPs for Wednesday and Thursday.
This hardly puts them at any kind of FP booking advantage vs. someone who booked a 10-night stay, grabbed their FPs for 60+11 days and then canceled or shortened their reservation.