Dr. Ali E. Haas is a cosmetic plastic surgeon. He is not a mechanical engineer nor a tribologist.
In his writings that I've read, I haven't seen anything about the action that actually separates the metal parts. It is not oil pressure
from the oil pump. In every rotating journal bearing, mains, crank, camshaft, the hydrodynamic wedge of oil that is created by the rotation holds the parts apart, sometimes up to 10,000 psi
in the bearing. Oil flow merely makes up for the oil that leaks out the ends of the bearings, and of course, carries away heat and debris. I've operated self-contained oil bath (no pump) bearings with a 30" diameter shaft, 60,000 hp, turning at 95 rpm. The hydrodynamic oil wedge caused by the rotation lifts the solid steel shaft and keeps the journal from touching the babbit bearing shell. No oil flow, no pump, no pressure, just running in an oil sump with 30 wt oil (ISO 100).
http://www.substech.com/dokuwiki/doku.php?id=hydrodynamic_journal_bearing
http://www.machinerylubrication.com/Read/779/journal-bearing-lubrication
There are some non-rotating bearings where the oil pump pressure holds the parts apart...oscillating bearings in wrist pins are one example.
If the oil's film strength is inadequate, under load the oil wedge will break down and the parts will touch and fail. Other things remaining equal, the oil film strength relates to the oil's viscosity.