How on earth do you have a system that can’t figure out a giant fire truck in the opposing traffic lane and is driving towards you needs you to GTFO of the way? Even brand new human drivers can put that together.
Also, I 100% don’t buy that it couldn’t detect the siren sooner (and act accordingly until it knew what direction it was coming from). Even modestly cautious human drivers know you don’t enter an intersection if you even think you hear a siren for exactly this reason.
Either they lied or (more likely) their system is willfully negligent in safety protocols, which should come as a surprise to … no one.