Hard to understand, huhh?
"but compare this to one year into Wrath of the Lich King we had"
As he did not mention Onyxia, Naxx, EoE, VoA, Chamber of Aspects (Obsidian and Ruby sanctum)
But hey..compare the whole: LK had 16 dungeons, 8 raids... Legion have (so far) 13 dungeons, 4 raids....(including the currently not available instances)