Nope....H2O has more O (30%) than "air" which is 78% nitrogen and only 21% oxygen, with traces of water vapor (which has more O than the air it is in! lol!), carbon dioxide/monoxide, argon, ozone and various other trace components, this is why wet iron rusts faster than dry iron exposed only to air.

Just a little common sense applied to a lot of old Star Trek episodes reiterating the percentages of atmospheric gasses in the many "class M planets" (human breathable without respirator assistance) they came across in their "Treks" and putting together the obvious components of water being 2 hydrogen molecules to 1 oxygen, making it 66% H to 33% O rounded down to whole numbers.

However, this is not to say your suggestion is completely without merit, since stirring or agitating the water will expedite the oxidation process for replenishing new O molecules as they combine with the fe molecules.

But the way to REALLY increase the rate is CAREFULLYusing an OXIDIZER, which is anything with the "oxidizer" logo on it, but I would limit that to adding only Hydrogen Peroxide (if you look at it, it tells you what it is,one hydrogen per oxygen, or 1 H for each 1 O making this 50% oxygeninstead of the 30% that water has, and when this reacts with the iron, it will release only oxygen gas, and leave plain water as the byproduct, much safer than the other most common oxidizer found in a household... that I suggest to avoid all togetherwhich is....bleach..., because that releases chlorine gas which is poisonous/toxic!

Peace, Love, and Light!