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So, is the Keeling curve wrong then? That shows a definite upward trend in the airborne fraction (actually a molar ratio) of CO2.

The Keeling curve shows the amount of atmospheric CO2 compared to what else is in the air (CO2 in air : total air). We're talking about the amount of CO2 in the air compared to CO2 in the land/water (CO2 in air: CO2 elsewhere).

The trend in the second has not yet been observed to change: IOW, the land, oceans, and biosphere are absorbing as much of the newly-produced CO2 as they were before, as far as we can currently tell.
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