They objectively did reduce CC. All the biggest examples off CC were removed or nerfed heavily, like Cassidy’s flash, Brigs bash and Sombras hack/emp.
The flash was just replaced with a new long range nade that slows enemies and disables abilities, which is worse CC to play against than a stun if you got within 3m of him. Doomfist, wrecking ball still have entire CC kits, they added more CC to orisa, who now can push players, knockback players and pull players in and slow them. Junker queen pulls players, ramattra slows players, soujourn slows players, There is objectively more CC in the game, for every bit they removed, they added more. CC isn’t objectively a bad thing, the most annoying thing in the past was Mei, because she slowed you and froze you, now she just slows you. Being knocked about, slowed or abilities disabled is the most annoying form of CC to play against and that is what nearly every new champ has and what older champs have been reworked to.