1 Car plugged in. 54 A to spare under the charger's 90 A limit, so the car charges at its full 32 A, 7.4 kW.
Tap or drag for each stepLoads at 230 V, a 100 A fuse and the charger's house limit set at 90 A. The charger uses whatever is left under its limit, from 32 A down to 6 A, and pauses below that. It can only turn the car down, never the house. Typical figures, not a design.