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Maybe my wording is bit confusing..
What I meant was that the vacuum created by the turbo, pulling the air in (which you said is min. negative pressure) is enough to stop from getting the air into the combustion chamber. But also, the negative pressure being made by the combustion chamber could be small and short so small vacuum created by the intake could stop the air from entering.. If you look at the quote I posted, the volume of oil is 0.0005L or 0.5mL. Which is pretty small volume which tells me only need small amounts of vacuum created by the air speed thru the intake might be enough to stop air entering and causing bit more oil to be injected at higher load (high air speed thru the intake).
I also agree with you that once intake port opening in the engine the pressure of the combustion chamber will be positive and then the check valve will stop the air/fuel mixture to escape thru the oil injector port. But if it was still the case of clean air, mazda could of saved ton of money by just putting a filter on as you've stated.
I think the best way to figure this out would be to put a vacuum gauge on the oil jet nipple and see what kind of negative pressure it pulls. If it doesn't pull much, then my theory should hold true.. which is at high air speed thru the intake pipe causing higher negative pressure on the hose will stop air from getting in and increase oil flow... Otherwise, oil flow is just based solely on oil metering pump pressure and the air being sucked in thru the nipple. Which could possibly be true..
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