Your opponent is one of the best in the world and you didn't lose by 40 against him ;) Salary isn't the only indication of the qualities of one player and he got plenty of good players with secondaries.
You were unlucky from the 3pointer 1-12 and you had 7 more turnovers.
In real basketball, this would be 7 potential fast breaks and " And-One's"
You had more than 20 fouls and your player ratings indicate a negative number, which possibly leads to the fact that your guys were outmatched by his players and you couldn't defend him.
However your team is strong ! ;)