Well spotted! Yes, we now have the NickToons on demand section. 🙂
As you've noted, Nickelodeon, Nick Jr and NickToons are all the same supplier, and some shows may seem to be available on more than one channel for a little while.
We've had the on demand "NickToons" shows on the service for a while, under one of the other channels. The supplier will be rearranging their content to the relevant sections.