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This is true. There is some important info in the original post though, and that's the part about part-throttle boost.
With a boost controller you'll be able to hit full boost at part throttle (the ECU normally prevents this). Since the ECU is expecting you to be off boost at part throttle it's still aiming for a 14.7 : 1 AFR (way too lean for on boost).
I seriously doubt the 19:1 claim though, that seems impossible and I've never heard anyone else say anything about AFRs leaner than 14.7 : 1 as a result of a boost controller.
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