I don't remember noticing any evidence of this. If true, it just further solidifies Lucio and one of the best characters in the game, jeez.
I wish I liked playing him more. I'm okay, and will do so in a pinch, but I'm never super excited to be playing Lucio, lol.
Wall riding and jumps are pretty fun but yeah his gameplay is pretty dull outside of that. You can do damage but you really can't kill people outside of environmental kills without a ton of help from your team.
Playing him is kind of relaxing though since he is hard to kill. You can focus on herding your team together and keeping them alive without thinking too much or juggling a ton of different things at once.