The bar does provide some free intervention services. Has he burned through those?
IIRC in the Bangladesh study the primary distancing effects were in the older, not the young, for which even with surgicals there wasn't a statistical difference for younger people. Even if you accept "maybe people in Bangladesh" find masks unattractive that would only mean they'd work in Bangladesh and places were similar cultures....not that "the effect is still that surgical masks reduced transmission". Like Hound said, you complain about these things, but then when you do em yourself it's perfectly acceptable. A better, more scientific approach is not to say anything (except perhaps a definitive RCS) proves anything, but rather that it is "interesting" and see where else it leads us.
Oster is basically saying the same thing I've been saying since spring of last year. Masks on a micro level are probably effective on a short term basis. If you have students with ill fitting cloth masks though crowded in a room with only adequate ventilation for 6-9 hours, they ain't gonna doing anything. Same with the passenger sitting on a bus or an airplane who is sick next to you. Same with the coworker in the meat packing plant or sharing the cubicle next to yours.