I think is better if you can explain or elaborate based on the text and examples in the manual.
What i interpreted from your statement was that EV does not work in P mode since it doesn't work in M mode. That what the sentence literally means.
I would phrase it as "Furthermore you said that EV also works in P mode AND M mode, this is wrong" if that was what you meant.
After some reading up/discussion, what you are trying to highlight:
Got this from another forum which I think explains what you are trying to say best:
Regarding specifically Nikon D700
It does not change your exposure, this is left to your manual settings. However it shifts your metering.
So if you set your +/- to -1 the meter will guide your shot to 1 stop underexposed.
Interesting.
However, this is NOT a feature in many cameras. Perhaps only Nikon cameras, I do not know. Definitely not TS camera, which is a Canon 550D. Neither is it a feature on my camera, or many cameras out there. Personally, pressing the EV comp button in M on my camera alternates between letting you select shutter speed and aperture.
Also, my sentence is phrased perfectly fine. Please read again. The fact that you said EV comp works ALSO in P mode, implies that it works in both M and P, which is not the case, keyword being "also".
I hope this makes sense.