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The args argument contains arguments that are directly passed unaltered to the executable when starting it. Your second example for instance is the same as manually starting the node using rosrun like this (ignoring the node name change):

rosrun binary_symlinks qpreprocessor_node --inputTopic=/drop/points --downsample=0.008 --removeOutliers=true --outlierRadius=0.016 --outlierMinK=0 --clusterMinSize=15 --zClipLow=-0.02 --backgroundRead=false --backgroundFile=/home/alex/Desktop/preprocessor.yml