If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...
How can such a small amount of spring tension seal against thousands of PSI (Pounds Per Square Inch) of combustion pressure??
Of course it can't.

I had read that article before, the author lost all credibility with me with the "Thousands of PSI " of combustion chamber pressure statement. More like 160 - 180 PSI?