so how has the right decision been made ?
Well, of the two realistic bids, West Ham's was the superior.
So why do you want the athletic track to be removed? The only one that proposed removing the track was Spurs' bid.
The positives of the West Ham bid outweigh the negative of having the track, i.e West Ham are the closer team (than Spurs) and Spurs are a detestable club.