Isn't the auto brake only active at lower speeds? (<50 km/h is a figure that rings a bell). The car was driving 61 km/h which is higher than normal "city speeds".
I don't know about that specific model of Volvo, but the emergency brake works up to much higher speeds in other cars/brands - it's just that above 50km/h it's not guaranteed to slow down to zero or prevent impact, just reduce the speed. I suspect that system was disabled as it would interfere with whatever driving tech tech have though.