An iFixit display guide documents removing the glued OLED panel and warns that water resistance may not be restored after a screen repair.
What to check before buying
OLED display
The available iFixit guide shows replacement of a cracked Tab S9 OLED panel. It describes a de-gluing process, so a screen quote should include adhesive removal and reassembly work.
Water resistance
The guide warns that opening the tablet compromises its water resistance and does not guarantee the original protection after reassembly. Treat a seller's claim of restored sealing after a previous screen repair carefully.