This is not to anybody in particular... but I think some of you guys don't understand how a car ECU works.
First of all it is designed so that the same engine can operate in different parts of the world, different climates/elevations ON THE SAME ECU.
Just think about it, you can drive an Accord in 120degree weather and you can drive it in -10 degree weather. You can drive it at sea level and you can drive it in Denver at a mile above sea level.... at which point your engine makes like 10-15% less power than at sea level but it still runs on the same ECU!
It cannot tell if there is a change in compression! With such a minor change in compression, it will still run the same just make maybe 2% less power.
Also, IF an ECU was really THAT sensitive to changes and freaked out if the fuel mixture changed a tiny bit (which it doesn't), then nobody would be able to do any modifications to intake or exhaust without engine management and a tune. It can compensate quite a bit before it throws a CEL.