Why is this pawn down a 5 point difference?

@ move 10

It's double bishops vs knight bishop, but whites dark squared is useless at that moment and I dont see a 5 point difference there.

The black bishop and knight are pushed out of the center by the advancing white pawns. Black soon loses a second pawn at b7.
The white light square bishop is very strong in this open position, as he has no opponent.

thank you tpr

You can unblock the dark square bishop by moving the pawn to d4, so this bishop will defend the pawn structure or you could have played it on a3 to have the exchange, but given how the game continued, you already played the best options, explaining the advantage given in the analysis, since your Queen+ light square Bishop+Rook were already in place to attack opponent's castling.

Kind regards

Thanks CSKA_Moscou