Yeah sure - not doubting that is a thing. However, given that plenty of other clubs do it, im sure that's not the main stumbling block. The simple reason is most likely that CityTV actually have a pretty small team, and unless there's a huge hunger for it, they probably won't stretch their resources to cover it.
When there was loads of hype around the 18s team that had Foden, Sancho and Brahim in it, with loads clamouring to watch them, they showed the games more regularly. The teams since havent been quite as hyped so i think they don't bother really.