Bad analysis. You're just cherry picking to fit your point of view.
Here's Houston's points per 100 possessions for each of the last 10 games. I've bolded the games they lost. The league average is 110 by the way.
109.6
118.1
124.6
112.2
125.8
107.7
132.5
115.2
116.6
125.1
- They lost when Harden had these oRTG's: 133, 110, 104, 99
- Then won when Harden had these oRTG's, 127, 145, 125, 121, 125, 117
The real correlation isn't field goals attempted (and even if you want to go that route, you know to use shot equivalents / possessions used not field goals attempted), it's efficiency. 3 of the 4 games they lost they had an above average offense. They have the 2nd ranked offense and the 26th ranked defense. Whatever Harden is doing on offense, it's working.