Have Sollux and Aradia ever met in person before Aradias death (not counting when he killed her)? And what did Sollux mean when he said to Aradia in front of the Green Sun that he could only see 2D, could he see her or anybody at all?

They’ve probably met given Aradia said “ He surely would have told you if he was making the trip all the way out here from his hive stem”

And when Sollux said he could only see in 2D he meant that he was blind in one eye so he had no depth perception.