WHAT!? Variation of Gruenfeld

The game above is 

San Segundo Carrillo Pablo (2528) vs. Illescas Cordoba Miguel (2577)

if you look on move 6. white plays Nf3 why would he not take the Knight with either Nxd5 or exd5??

A further mystery is you you look at this position in game explorer 

http://www.chess.com/explorer/index.html?id=26159&ply=10&black=0

you find that the only move really is Nf3! 

I figure I must be missing something - maybe a trap. IDK!

can anyone shed some light on the situation?

Thanks!

Yes, the score of the game must be wrong. Happens a lot if it's a rapid or blitz event.

I searched for position in my million database.

Only 4 games, and only game did take the knight.
And it resulted in an intense game in which black had a lot of counterplay but white managed to win after a long game.