Earlier this year it was reported that BOE failed to pass Apple's quality tests and did not become a supplier to the iPhone 12 series (BOE also failed to pass Samsung Electronics's display quality test).
According to a new report from Korea, Apple has tested BOE's AMOLEDs for next year's iPhones, but again BOE's OLED production quality is not good enough for Apple, which means that in 2021 Samsung Display and LG Display will remain the exclusive OLED suppliers to Apple's phones. In 2021 it is likely that Apple will introduce LTPO displays in addition to screens with a 120Hz refresh rates and on-cell touch.
It seems as if Apple's main is BOE's low production yields. The US company is considering to adopt BOE's panels for aftermarket production (refurbished iPhones and screen repairs).