Its been 5 years and still no word on something RIOT said. Can a RIOT employee please answer this

Campions are being rotated during seasons, including "in-season" champions, this means while you can play all the champs in Normal Games, there will be some Champions that won't be allowed in the Ranked Games:

That's a very insightful question. We thought a lot about that, and in the short term, we're going to keep releasing champions. In the longer term, as we roll out competitive seasons, our first season will include all champions, but our additional seasons will feature a reduced set of "in-season" champions. This means that -- while you can always play all champions in [casual play] -- the featured competitive mode will have a reduced set of champions that rotates periodically as we cycle through seasons. This allows us to revitalize the metagame; if a particular strategy is getting really strong, one way to make things interesting is to just change the champion rotation. And it also reduces the learning burden for someone coming in, so they don't have to learn 60 champions -- they only have to learn 35 or 40, or whatever number we determine.

TL:DR Champions are not being rotated like they said they were going to do