I checked my upcoming flight, you are right! 2x50, but my status allows 3, so something is off. Also the baggage allowance rules still shows 2x70.
So they also changed the rules on existing tickets?
Pretty sure this is fakenews. They've had this bug for years now. It does show 70lb when booking through the app.
You're right about the app showing 70lb when booking business class. However, I checked on an existing itinerary on the website and on the app and on their "baggage-calculator" as wellIn the last few years it always showed 70lb for business class.
Showing 2x 50 for me as well, domestic F. Very annoying.