Does Potassium Superoxide also absorb Carbon Monoxide?
As the other answer and comments imply, potassium superoxide is not a good reagent for absorbing carbon monoxide.  Cuprous chloride solution works better, as in this study[1] where the salt is dissolved in an ammonia-bearing solution.
Reference:

R. V. Gholap and R. V. Chaudhari, &quot;Absorption of carbon monoxide with reversible reaction in cuprous chloride solutions&quot;, Ind. Eng. Chem. Res. 27, 11, 2105–2110 (1988).