This walkthrough will show you how to beat Dimitri without taking any damage in Sly 2 Band of Thieves (2024) on PS5 and PS4.
Use the following video as a reference:
When he tries to shoot at you, try to hide behind a pillar. His gun will always jam after the third shot fired, so run towards him when you get an opening. If you get close enough, try to attack him.
For his melee attacks, jump backwards to avoid them. You can then do a quick counterattack.
Keep repeating these strategies to defeat Dimitri without getting hit.