Er? He has 4 guys with 8000+ salary. So it's not such a clear comparison as you stated.
Then, he CTed, and you TIE.
Next, he's at home.
Next, your GS stunk, his was good.
Next, he had a better bench, or at least he used them. Your guys all played essentially the entire game, meaning that on average they didn't perform up to their salary/gameshape level, due to being tired.
Frankly, I'd have been surprised had you won even on equal effort.
Plus, with his players I'm not sure you can go only by salary. Why? Well his big men and SFs had quite a few assists in that game (he had overall very good flow). Passing doesn't add much to their salaries, but it makes them a lot more effective. And, I wouldn't be surprised if his cheaper guys have good defensive skills, which are relatively cheaper than the corresponding jump shot levels.