You’re not getting an OLED. Apple wouldn’t invest into Mini LED for just one generation, and in many ways, it’s better for this kind of device (iPad, Mac, etc.) With this high contrast ratio and 1600 nit peak brightness, it’s obvious this is their answer to OLED tablets and laptops. I expect it to look amazing, get near OLED levels of contrast, higher peak brightness and no burn in when using static elements like UI.
This is very advanced, modern screen tech. I wouldn’t dismiss it before seeing it.