Well, the difference is RMB deflate because it is the government themselves are doing that, they want to have more share in the IMB currency basket.
Rouble deflate because of the currency situation, bear in mind, the backing of Russia currency is gas and oil trade (Which account for 36% of their total GDP, 47% of all Trade) Which are supposed to be untouchable because this is High Demand commodity. That is the reason why Rouble has been quite steady the whole year before the invasion at 0.012 or 0.013. But this drop would signal the defuncting of Russia Oil and Gas backing. And they probably can't find anyone who can pay for those Oil and Gas to cover what they had lost in EU, China can take some, but they can't take the entire EU consumption, (EU consume more oil and gas than China) And that is why the currency is tumbling, and that will not be changed unless Russia found something else to sell or found someone else to sell to. Which will be hard consider US, Canada, EU and UK is about 70% of world economy. Who can Russia sell to other than China? Syria? Kazakhstan? Or Venezuela?
That is why China is now calling Russia to mediate. Because doing that to Russia is not good for China.
As for RT ban, EU/NATO literally is at war with Russia, make no mistake, this war is not about Ukraine, but about NATO and EU, so I don't see no problem for EU or Anyone banning the Propaganda Media Arm of a Country, if US is at war with China, do you think they will let CGTN keep operating in US? Well, we will be consider lucky if they didn't round every Chinese up like they do with the Japanese back in WW2. (By the way, back in WW2, listening to Japan broadcast, ether Radio or TV is punishable by death in the US.) The same thing with UK and Germany.