Yes, could well be.
However,
Compensation for higher MP usually means a lower RPM which is far more beneficial for any reciprocating engine.
I have not seen evidence for this. Can you find any?
Lower RPM does result in very definitely better MPG - some 10% better between 2200 and my max of 2575. But that's not the same thing as a proof of longer engine life. Also, some engines have a limit on the MP at lower RPM values.