I know that's what it seems to be saying, but that doesn't track with my observations about using it. There have been times when I've had 2 Chi, used Jab, and seen the "+2 Chi" and "+1 Chi" messages scroll up that indicate a Power Strikes usage, but no Chi Sphere was generated.
From a more careful reading of Power Strikes, it seems to indicate that if you're at max Chi when you use Jab that would generate a Power Strike, then you will get a Chi Sphere. But why you're using Jab at full Chi is beyond me.
So, yes, we have read the tooltip. But the gameplay doesn't seem to align with it.