Mte. Quorum is irrelevant. The heavy marketing for this film probably won’t even kick in until October. The cast not being able to promote is unfortunate but I’m sure they did some promo prior to the strikes like a magazine covers and interviews. And stars are allowed to post their photo shoots on social media (that’s where timothee and zendaya, flo etc can come in) who knows the strike might be over by that point so they may not have to worry about that anyways.