To me, No, it really doesn't make sense at all.IF AN ENGINE HAD that pressure with non-syn, what ever the pressure is with synthetic IS WHAT IT WILL BE WITH SYNTHETIC, unless all the clearances are adjusted for the change. Does this make sense?
The hot viscosity of an oil is what will eventually determine hot oil pressure. This will differ between oils (not all oils with a weight of 20W50 have the same hot viscosity) but is not really a function of Synthetic vs. Conventional oil composition.
The viscosity it typically measured as cSt @ 40º C (cold) and cSt @ 100º C (hot).
What I am really saying is that it's the numbers, not whether an oil is Synthetic or Conventional, that determines what the oil pressure will be.
One of the benefits of a good synthetic is that it will not shear down out of it's grade with heat and/or high RPM use. Some (note I did not say all) conventional oils have a problem with this. For an example, a 20W50 oil that has sheared down would only have the hot viscosity of a 10W40 oil.