Hard to say when his only argument is "is in fact high grade nonsense". He's missing the big picture though: performance matters but not completely, it's not two way binding that makes two way binding bad, its developers using two way binding that makes it bad.
I also think it's ignorant to say it's fashionable to avoid two way binding, I've seen teams greatly benefit from avoiding it, teams with less experienced devs and devs who I've previously seen write terrible code. Maybe now two way binding would be easier for them, though I don't know; I'm unlikely to suggest they 180 on tech that has made them much more successful.
I also think it's ignorant to say it's fashionable to avoid two way binding, I've seen teams greatly benefit from avoiding it, teams with less experienced devs and devs who I've previously seen write terrible code. Maybe now two way binding would be easier for them, though I don't know; I'm unlikely to suggest they 180 on tech that has made them much more successful.