Dose iPad Pro 12.9 A1584 has LCD screen?

All models of iPad have an LCD screen - although some models use a fully laminated display construction.

All except the 2021 iPad Pro models use edge-lit backlighting. Only the 2021 iPad Pro models benefit from a miniLED array backlight.

Yes.

https://www.gsmarena.com/apple_ipad_pro_12_9_(2015)-7562.php#a1584

ALL iPads use LCD screen, except the newest iPad Pro models.

BTW, that iPad Pro model number is for a 2015/2016, 12.9 inch screen iPad Pro model.

Same model iPad Pros that I have been using for the past 5-6 years.