Presumably this is 98% accuracy per sample or something, not per session of crying. I wouldn't want to leave my kid completely unanswered 1/50th of the time if he actually needed me, but I think with the model as trained, regular crying would eventually get noticed and that's fine with me.
Somewhere else on the thread though somebody else called out the real downside of this model: it overfits on regular crying. Kids make all kinds of noises. Mine made a completely different, eldritch noise one time when he noticed a spider, for instance.