I was all ready to be pissed at the dark matter video but I surprised myself by liking it so much. Yup, definitely measuring mass, no getting around that. Is it a screwup in our measuring ability? An artifact of an even-weirder-than-imagined spacetime? Can't tell, doesn't matter. That isn't what's being discussed. It's mass, it's out there. Go from there. I got the feeling her real ire is for people who just generally go "man, I think you're just, like, making stuff up".