>>Also since it charges at 85 kW in standard, I don't understand the advantage for them to do the battery swapping
Battery lifetime is reduced by fast charging. In this business model, the driver owns the car but "rents" the battery, so it makes sense for the company that actually owns the batteries to get the most charge cycles out of them they can by slow charging. Also, if you have to wait for 30 minutes while someone else is using the only fast charger at a station, your "fast" charge now takes an hour AND you've degraded your battery. The battery swapping system actually needs less infrastructure than installing a bunch of redundant fast chargers just to handle peak demand.