Who is crankshaft depot?

They are one of the importers of chinese made engine parts, ( like K1- CAT-Scat- etc)
I have a set of those rods, they checked out fine, ( round, and in spec)
 
A third hole is drilled at top of the small end to bleed air in the aerated lube system to protect piston pin from direct impact.

What does this mean? I was unaware our cars were equipped with an aerated lube system. And what is going to impact the piston pin directly, or indirectly for that matter?
 
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