Why do Non-projectile abilities get blocked by Yasuo's Wind Wall??????

So like, I play this ranked match as , I was in a fight against and I realized that when I went to go use my ultimate ability against he used his wind wall to block it. Now why is it that non-projectiles like Poppy's Ult get block by Yasuo's wind wall IT MAKES NO SENCE AT ALL

Yasuo's Wind wall Clearly states that it "blocks all enemy projectiles" Poppy's Keeper's Verdict also clearly states that upon second cast Poppy "smashes the ground, sending out a shockwave"

http://leagueoflegends.wikia.com/wiki/Poppy http://leagueoflegends.wikia.com/wiki/Yasuo

Thoughts & Opinions?