Black plays d5 just to high-five white. 
what is the importance of d5 square for back in the sicilian defense
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Oct 4, 2019
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#3
Typically, the d5 move will enable Black to free his cramped position, neutralize White's space advantage, and often to trade off White's last center Pawn.
But the d5 move must be timed correctly, or it leads to White's advantage instead of Black's.
Here's an example of the disastrous consequences that can follow when Black plays d5 without proper preparation:
why d5 move is important for black to play and for white to prevent it in the sicilian defense